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BNC: 2247 COCA: 1284
guardnoun [ C ]uk/ɡɑːd/ us/ɡɑːrd/

guard noun [ C ] PERSON WHO PROTECTS

B1 a person or group of people whose job is to protect a person, place, or thing from danger or attack, or to prevent a person such as a criminal from escaping卫兵，警卫；看守，守卫

prison guards狱警
security guards保安
There are guards posted (= standing and watching) at every entrance.每个入口处都设了卫兵。
Armed guards are posted around the site.现场周围布设了武装警卫。
The frontier is patrolled by border guards.边境警卫队沿国境巡逻。
be under guard

to be kept in a place by a group of people who have weapons处于武装人员的保护（或守卫）之下

The ex-president was under armed guard in the palace.前总统在宫中处于武装警卫的保护之下。
stand/keep guard also be on guard

to be responsible for protecting someone or something, or for preventing someone from escaping守卫；站岗；看守

Two of the soldiers kept guard over the captured guns.两名士兵看守着缴获的枪支。
Armed police stand guard outside the house.武装警察在房外守卫。
the changing of the guard

a ceremony held outside Buckingham Palace in London, where one set of soldiers replaces the soldiers who have finished their time on duty standing outside the palace白金汉宫皇家卫队换岗（仪式）

More examples

They tried to buy the guard at the bank off but he told the police and the gang were arrested.

The guards failed to observe who delivered the package.

The border guards stopped me and asked to see my papers.

There are guards on the door to keep out undesirables.

Armed guards were stationed around the airport.

guard noun [ C ] ON A TRAIN

UK US conductor a railway official who travels on and is responsible for a train列车长

guard noun [ C ] DEVICE

a device that protects a dangerous part of something or that protects something from getting damaged保护装置；保护用品；保护器

a fire guard火灾防护装置
a trigger guard（锁定）枪（扳机）的保险
The helmet has a face guard attached.这个头盔带有一个防护面罩。

Idiom(s)

be on (your) guard
catch sb off guard
drop/lower your guard
guardverb [ T ]uk/ɡɑːd/ us/ɡɑːrd/

guard verb [ T ] WATCH

B2 to protect someone or something from being attacked or stolen保卫，守卫，保护

Soldiers guard the main doors of the embassy.大使馆的主要门口都有士兵把守。

B2 to watch someone and make certain they do not escape from a place看守，监视

Five prison officers guarded the prisoners.5名狱警看守着犯人。

More examples

The village was guarded by a ragtag group of soldiers.

The offices were securely guarded.

Armed security officers are employed to guard the president.

The police officers guarding the door let in the celebrities, but they prevented us lesser/mere mortals from going inside.

He was employed to guard the singer when she was on tour.

guard verb [ T ] NOT TELL

to keep information secret保守（秘密）；遮掩

Journalists jealously (= carefully) guard their sources of information.记者们非常小心，对消息来源守口如瓶。

Phrasal verb(s)

guard against sth
the Guardnoun [ S ]

informal for the National Guard 国民警卫队（the National Guard的非正式说法）

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