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IELTS BNC: 1960 COCA: 2078
signalnoun [ C ]uk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/

signal noun [ C ] ACTION

B2 an action, movement, or sound that gives information, a message, a warning, or an order信号

When she gave (them) the signal, they all cheered.她发出信号后，他们都欢呼起来。
[ + that ] The fireworks were a signal that the festival had started.焰火是节日开始的信号。
[ + to infinitive ] The police officer gave us the signal to stop.警察示意我们停下。
The signal for a race to start is often the firing of a gun.赛跑常以发令枪响作为开始的信号。

US UK indicator a turn signal （车辆）转向灯（同 turn signal）

More examples

At a prearranged signal, everyone started moving forwards.

I usually set my watch by the time signal on the radio.

At the given signal, the group rushed forward to the barrier.

I've been trying to call him all evening, but I keep getting the engaged signal.

A whistle is the signal for the children to line up ready to go into the classroom.

signal noun [ C ] WAVE

B2 a series of electrical or radio waves that are sent to a radio or television in order to produce a sound, picture, or message（用于传输声音、图像或其他信息的）电波信号

Examples

The picture quality is bad because the TV signal isn't powerful enough.

The equipment sent out a regular high-pitched signal.

There is some interference on the signal - do not adjust your set.

signal noun [ C ] SHOWING

something that shows that something else exists or is likely to happen迹象

The loss is a clear signal of his deteriorating confidence.比赛输了，这清楚地表明他信心日渐不足。
The changing colour of the leaves on the trees is a signal that it will soon be autumn.树叶颜色的改变表明秋天即将来临。

signal noun [ C ] EQUIPMENT

equipment, especially on the side of a railway or road, often with lights, that tells drivers to stop, continue, or go more slowly（尤指铁路或公路上的）信号灯

a railway signal铁路信号灯
a traffic signal交通信号灯
a road signal道路信号灯
signalverbuk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/ -ll- or US usually -l-

signal verb ACTION

C2 [ I or T ] to make a movement, sound, flash, etc. that gives information or tells people what to do发信号；示意

Flashing lights on a parked car usually signal a warning (to other drivers).停着的车辆上闪烁的车灯通常是警告（其他驾车者）的信号。
He signalled left, and turned the lorry slowly.他打开左转方向灯，然后将卡车缓慢转过去。
He was signalling (= giving a signal) with a red flag.他正用红色旗子发信号。
She signalled for help.她发出了求救信号。
[ + that ] She signalled to the cars behind her that they were going the wrong way.她示意后面的车辆走错了路。
[ + obj + to infinitive ] The children's mother signalled them to be quiet.孩子们的母亲示意他们安静。
[ + to infinitive ] The children's mother signalled to/for them to be quiet.孩子们的母亲向他们示意保持安静。

More examples

She signalled to them to sit down.

The ship signalled for help.

A flashing light signalled that there was danger ahead.

I signalled left and turned into the driveway.

signal verb SHOW

[ T ] to show that you intend or are ready to do something表达，表示；显示

[ + that ] The union has signalled that the workers will strike.工会表示工人们将会罢工。
The union has signalled the workers' intention to strike.工会已表示工人们打算罢工。
The death of Chairman Mao signalled (= marked) the end of an era in Chinese history.毛主席的去世标志着中国历史上一个时代的结束。
signaladjective [ before noun ]uk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/ formal

noticeable and unusual显著的；不寻常的

a signal success/failure重大胜利／失败
IELTS BNC: 1960 COCA: 2078
signal

noun¹

 1sign/action/sound that sends a message標誌；動作；聲音ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | PREPOSITION ADJECTIVE➤clear, unmistakable清晰的／明確無誤的信號▸➤agreed, prearranged約好的／事先約定的信號▸➤conflicting, confusing, contradictory, mixed相互衝突的信號；讓人迷惑不解的信號；有歧義的信號▸➤wrong錯誤信號◇Laughing when you should be crying sends out the wrong signals to people.應該哭的時候卻笑，就向人們傳達了錯誤的信號。➤alarm, danger, distress, warning報警／危險／求救／警告信號▸➤hand, non-verbal, smoke, visual手勢；非語言信號；煙霧信號；視覺信號▸➤turn (NAmE) （汽車上的）轉向指示燈▸➤busy (NAmE) (engaged tone in BrE) （電話佔線時的）忙音◇All I get is a busy signal when I dial his number.我給他撥電話只能聽到佔線的忙音信號。➤buy, sell (both business商業) 買入／賣出信號◇A strong buy signal was issued to traders.交易員收到了強烈的買入信號。VERB + SIGNAL➤give (sb), make, send, send out（給某人）發信號；打信號◇When I give the signal, run!我一發信號，你就跑！➤interpret, read解讀信號◇The brain interprets the signals from the retina as light.大腦把來自視網膜的信號解讀為光。➤interpret sth as把⋯理解為信號◇The remark was interpreted as a signal that their government was ready to return to the peace talks.該言論被視作政府準備重回和平談判的信號。➤pick up, respond to領會信號；對信號作出反應◇Interviewers quickly learn to pick up non-verbal signals.採訪者很快學會讀懂非語言信號。➤act as作為信號◇The insect's yellow spots act as a warning signal to its predators.昆蟲身上的黃點是向其天敵發出的警告信號。SIGNAL + VERB➤come from sth信號來自⋯◇Try to read the signals coming from the patient.要盡量讀懂病人發出的信號。➤indicate sth信號表示⋯◇the signals that can indicate danger可能預示危險的信號PREPOSITION➤at a signal, on a signal按照信號◇At a prearranged signal, everyone started cheering.看到預先約好的信號，大家都開始歡呼起來。➤signal for示意⋯的信號◇She made a signal for the car to stop.她打了個手勢，讓汽車停下了。➤signal from, signal to來自⋯的／給⋯的信號◇Wait for the signal from the leader of your group.等你們組的組長發出信號。
signal

noun²

 2set of lights for drivers交通信號燈ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | SIGNAL + NOUN ADJECTIVE➤railroad, railway, traffic鐵路信號燈；交通信號燈VERB + SIGNAL➤operate操作信號燈SIGNAL + VERB➤be on red/green, be red/green紅燈亮；綠燈亮◇The traffic signals were on red.交通信號亮着紅燈。➤fail信號燈失靈SIGNAL + NOUN➤box (BrE) （鐵路上的）信號樓▸➤failure (BrE) 信號燈故障
signal

noun³

 3series of radio waves, chemical messages, etc.無線電波；化學信息ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | SIGNAL + NOUN | PREPOSITION ADJECTIVE➤faint, weak微弱的信號▸➤strong強信號▸➤high-frequency, low-frequency高頻／低頻信號➤input, output輸入／輸出信號▸➤acoustic, analogue/analog, audio, chemical, digital, electrical, electronic, GPS, light, radar, radio, satellite, sonar, sound, television, TV, video, wireless聲學信號；模擬信號；音頻信號；化學信號；數字信號；電信號；電子信號；全球定位系統信號；光信號；雷達信號；無線電信號；衞星信號；聲納信號；音頻信號；電視信號；視頻信號；無線信號VERB + SIGNAL➤carry, pass, relay傳送／傳遞／中繼轉發信號◇The nerves carry these signals to the brain.神經把這些信號傳給大腦。➤amplify, boost放大／增強信號▸➤convert (sth into), scramble（把⋯）轉換成信號；對信號作擾碼處理◇The signal is scrambled into code before it is sent.發送信號之前要先擾碼，把它變成密碼。➤decode, encode解碼信號；把信號編碼▸➤emit, generate, produce, send, transmit發射信號；發出信號；發送信號▸➤detect, pick up, receive, respond to探測信號；接收信號；對信號作出回應◇This equipment can detect very low-frequency signals.這種設備能夠探測甚低頻信號。➤block, jam攔截／干擾信號◇It is possible to jam GPS signals in battle.在作戰時對全球定位系統的信號進行干擾是可能的。SIGNAL + VERB➤travel信號傳播◇The digital signal travels down wires to the server.數字信號沿着線路傳到服務器。◇A light signal can travel well over 16 km before it halves in intensity.光信號傳播 16 公里以上強度才會減半。➤fade信號漸弱SIGNAL + NOUN➤intensity, strength信號強度PREPOSITION➤signal from來自⋯的信號◇a faint signal from the satellite衞星發出的微弱信號➤signal to向⋯發出的信號
signal

verb¹

 1move your arms to give a signal打手勢ADVERB | PREPOSITION ADVERB➤frantically瘋狂打手勢◇I saw her signal frantically to us.我看見她瘋了似的朝我們打手勢。PREPOSITION➤for示意⋯◇He raised his hand to signal for the waiter.他舉起手向侍者示意。➤to向⋯打手勢◇She tried to signal to the bus driver to stop.她試圖打手勢讓公共汽車司機停車。
signal

verb²

 2show/mark sth表明ADVERB | VERB + SIGNAL ADVERB➤clearly清楚地標誌◇These changes clearly signal the end of the welfare state as we know it.這些變化清楚地標誌着我們熟悉的福利國家的終結。➤effectively (especially BrE) 實際上表明◇A change of mind effectively signals a change in overall policy.改變主意實際上意味着整個政策有所改變。➤not necessarily不一定預示◇A fall in demand does not necessarily signal the death of the industry.需求的減少並不一定意味着該行業走向窮途末路。VERB + SIGNAL➤appear to, seem to似乎／好像預示◇These events appeared to signal the end of an era.這些事件似乎預示着一個時代的結束。➤try to試圖表明➤be intended to, be meant to旨在／意欲表明◇This address was meant to signal a change in policy.這個講話意欲表明政策將有所改變。
IELTS BNC: 1960 COCA: 2078
signal verb
⇨ mean 1 (signal a change in policy) ⇨ nod (Don't fire until I signal.)signal noun
⇨ signal (give sb a signal) ⇨ sign 1 (a clear signal that sth is wrong)signal

noun

signal ♦︎ sign ♦︎ cueThese are all words for a movement, sound or event that gives sb information or tells sb to do sth. 这些词均表示信号、暗号。PATTERNS AND COLLOCATIONS 句型和搭配◆a signal / sign / cue for sb / sth◆a signal / sign / cue (for sb) to do sth◆a clear signal / sign / cue◆a warning signal / sign◆to wait for / miss a / your signal / sign / cue◆to understand / misunderstand a / sb's signal / sign◆to give sb a signal / sign / cue◆to make a signal / sign■ signal [countable] a movement or sound that you make to give sb information, instructions, a warning, etc. 示意的动作（或声音）；信号；暗号◆a danger / distress signal危险／求救信号◆At an agreed signal they left the room.收到约定的信号后，他们离开了房间。◆The siren was a signal for everyone to leave the building.警报声就是要所有人都离开大楼的信号。◆When I give the signal, run!我一发信号，你们就跑！◆ (NAmE) All I get is a busy signal when I dial his number (= his phone is being used).我什么时候拨他的电话，听到的都是忙音。  see also signal ⇨ nod verb ■ sign [countable] a movement or sound that you make to tell sb sth 示意的动作（或声音）；手势◆He gave a thumbs-up sign.他竖起大拇指表示赞同。◆She nodded as a sign for us to sit down.她点头示意我们坐下。NOTE 辨析 Signal or sign?A sign is usually a hand movement, and is often fairly fixed and likely to be understood by people in general; signal has a wider range, and may have been invented by individuals in a particular situation. * sign通常指一种手势，而且常常是比较固定的，人们一般都能够理解；signal的范围更广泛些，可能是个人在特定情况下发明出来的◆sign language (= a system of communicating with people by using hand movements rather than spoken words) 手势语◆a V-sign (= a sign that you make by holding up your hand and making a V-shape with your first and second fingers) V字形手势◆We agreed on a signal to mean 'stop'.我们约定了一种表示“停止”的信号。 ■ cue [countable] an action or event that is a signal for sb to do sth 暗示；提示；信号◆Jon's arrival was a cue for more champagne.乔恩的到来意味着要喝更多的香槟酒。◆I think that's my cue to explain why I'm here.我想这是要我解释为什么到这里来。◆ (figurative) 'Where is that boy?' As if on cue, Simon appeared in the doorway (= as if sb had given him a signal).“那男孩在哪里？”这话一出，西蒙像接到了信号一样出现在门口。◆ (figurative) Investors are taking their cue from the big banks and selling dollars (= taking what other people do as a sign for them to do the same).投资者看到大银行抛售美元，纷纷效法。
IELTS BNC: 1960 COCA: 2078

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