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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

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