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VERB
守卫；护卫；警卫
If you guard a place, person, or object, you stand near them in order to watch and protect them.
例句
Gunmen guarded homes near the cemetery with shotguns...
持枪者手持猎枪守卫着墓地附近的房子。
...the heavily guarded courtroom.
戒备森严的法庭
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VERB
看守；监视
If you guard someone, you watch them and keep them in a particular place to stop them from escaping.
例句
Marines with rifles guarded them...
手持步枪的海军陆战队士兵监视着他们。
He is being guarded by a platoon of police.
有一队警察看守着他。
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N-COUNT
卫兵；警卫员；看守
A guard is someone such as a soldier, police officer, or prison officer who is guarding a particular place or person.
例句
The prisoners overpowered their guards and locked them in a cell.
囚犯们制服了监狱看守，并将他们锁进了牢房。
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N-SING-COLL
（一队）卫兵；（一队）警卫
A guard is a specially organized group of people, such as soldiers or policemen, who protect or watch someone or something.
例句
We have a security guard around the whole area...
我们在该地区各处部署了保安。
A heavily armed guard of police have sealed off the city centre.
一队全副武装的警察已经封锁了市中心。
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N-COUNT
列车长
On a train, a guard is a person whose job is to travel on the train in order to help passengers, check tickets, and make sure that the train travels safely and on time.
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VERB
保护；保守；遮掩
If you guard some information or advantage that you have, you try to protect it or keep it for yourself.
例句
He closely guarded her identity.
他对她的身份守口如瓶。
...a threat to the country's jealously guarded unity.
对该国珍惜维护的统一局面的威胁
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N-COUNT
保护装置；保护罩；保护器
A guard is a protective device which covers a part of someone's body or a dangerous part of a piece of equipment.
例句
...the chin guard of my helmet...
我头盔上的下巴保护罩
A blade guard is fitted to protect the operator.
为保证操作人员的人身安全安装了桨叶保护罩。
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N-IN-NAMES
（英国的）近卫军，禁军，近卫军士兵
Some regiments in the British Army, or the soldiers in them, are referred to as Guards.
例句
...the Grenadier Guards.
英国近卫步兵团
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PHRASE
乘（人）不备；使猝不及防
If someone catches you off guard, they surprise you by doing something you do not expect. If something catches you off guard, it surprises you by happening when you are not expecting it.
例句
Charm the audience and catch them off guard...
吸引观众的注意力，然后给他们来个出其不意。
The invitation had caught me off guard.
收到这份邀请让我颇感意外。
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PHRASE
丧失警惕；放松警惕；不提防
If you lower your guard ,let your guard down or drop your guard, you relax when you should be careful and alert, often with unpleasant consequences.
例句
The ANC could not afford to lower its guard until everything had been carried out...
非洲人国民大会在所有事项皆已完成前不敢有丝毫松懈。
You can't let your guard down...
你不能放松警惕。
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PHRASE
派人守卫；安排看守
If you mount guard or if you mount a guard, you organize people to watch or protect a person or place.
例句
They've even mounted guard outside the main hotel in the capital...
他们甚至派人在首都的大饭店外面站岗。
Police mounted round-the-clock guards on properties last night.
警方昨晚通宵值守财物。
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PHRASE
警惕；提防
If you are on your guard or on guard, you are being very careful because you think a situation might become difficult or dangerous.
例句
The police have questioned him thoroughly, and he'll be on his guard...
警方已经对他进行了详细的盘问，因此他会保持戒备心理。
He is constantly on guard against any threat of humiliation.
他时刻提防着任何有辱尊严之事。
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PHRASE
站岗；值班
If someone is on guard, they are on duty and responsible for guarding a particular place or person.
例句
Police were on guard at Barnet town hall.
警察在巴尼特市政厅值守。
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PHRASE
站岗；放哨
If you stand guard, you stand near a particular person or place because you are responsible for watching or protecting them.
例句
One young policeman stood guard outside the locked embassy gates.
一位年轻的警察在大门紧闭的使馆外站岗。
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PHRASE
在…看守之下
If someone is under guard, they are being guarded.
例句
Three men were arrested and one was under guard in hospital.
有3人被逮捕，1人在警方监护下送医院治疗。
Noun
1. a person who keeps watch over something or someone
2. the person who plays that position on a football team;
"the left guard was injured on the play"3. a device designed to prevent injury
4. a posture of defence in boxing or fencing;
"keep your guard up"5. the person who plays the position of guard on a basketball team
6. a group of men who escort and protect some important person
7. a precautionary measure warding off impending danger or damage or injury etc.;
"he put an ice pack on the injury as a precaution""an insurance policy is a good safeguard""we let our guard down"8. the duty of serving as a sentry;
"he was on guard that night"9. a position on the line of scrimmage;
"guards must be good blockers"10. a position on a basketball team
Verb
1. to keep watch over;
"there would be men guarding the horses"2. watch over or shield from danger or harm; protect;
"guard my possessions while I'm away"3. protect against a challenge or attack;
"Hold that position behind the trees!""Hold the bridge against the enemy's attacks"4. take precautions in order to avoid some unwanted consequence;
"guard against becoming too friendly with the staff""guard against infection"