词典释义：
watch over to keep safe
守卫；保卫
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they were sent to guard villagers from attack by bandits .他们被派去保护村民免受土匪袭击。
watch over in order to control entry and exit
警卫，把守
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the gates were guarded by uniformed soldiers .大门由穿军装的战士把守。
watch over (someone) to prevent them from escaping
看守，监视
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police officers were guarding inmates who cannot be accommodated in prison .警官们正在看守那些监狱容纳不下的犯人。
[no obj.](
警惕；防范
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farmers must guard against sudden changes in the market .农民必须警惕市场的突变。
protect against damage or harm
保护，维护
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the company fiercely guarded its independence .公司奋力维护自己的独立。
【篮球】 防（对手）。
a person who keeps watch, especially a soldier or other person formally assigned to protect a person or to control access to a place
警卫员；卫兵；看守
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a security guard 一个安全警卫
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[as modifier]
he distracted the soldier on guard duty .他使站岗的哨兵分散了注意力。
[treated as sing. or pl. ]a body of soldiers serving to protect a place or person
一队警卫（或卫兵、看守）
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the hound belonged to a member of the castle's guard .这条猎狗是城堡警卫队的一名队员的。
(
（英国）禁卫军。
〈北美〉 监狱看守。
〈爱尔兰〉 爱尔兰警察；卫兵。
〈英〉 列车长。
【美橄】 后卫。
【篮球】 后卫。
a device worn or fitted to prevent injury or damage
防护装置，保护罩；防护用品
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a retractable blade guard .能伸缩的刀片护罩。
a defensive posture that is adopted in a boxing or martial arts contest or in a fight
（拳击、武术比赛或打斗中的）防御姿势
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this kick can curl around an otherwise effective guard .这种踢法可以绕过原本有效的防御姿势。
a state of caution, vigilance, or preparedness against adverse circumstances
警惕，戒备，防备
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he let his guard slip enough to make some unwise comments .他放松了戒备，所以做出一些不明智的评论。
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guard of honour a group of soldiers ceremonially welcoming an important visitor 仪仗队 -
keep （或stand ）guard act as a guard 站岗，放哨 -
off guard unprepared for some surprise or difficulty 猝不及防，丧失警惕the government was caught off guard by the unexpected announcement ． 政府被这突如其来的声明弄得措手不及 -
on guard on duty to protect or defend something 站岗，放哨；值班 -
（亦作
on one's guard ）prepared for any contingency； vigilant 警惕，提防；警戒we must be on guard against such temptation ． 我们应警惕这种诱惑 -
raise one's guard adopt a defensive posture 摆出防御姿势 -
take guard Cricket （of a batsman） stand in position ready to receive the ball, especially having asked the umpire to check the position of one's bat with respect to the stumps 【板球】 （击球员）站到正确的击球位置 -
under guard being guarded 在看守下，在警卫下he was held in an empty stable under guard ． 他被关在一个有警卫看守的空马厩里
"late Middle English （in the sense ‘care, custody’）： from Old French
