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guard (n.)

15世纪早期, “看守的人, 士兵的身体”, 也是“照顾, 保管, 监护”, 也是一件盔甲的一部分的名称, 来自法语 garde “guardian, warden, keeper; watch, keeping, custody”, 来自古法语 garder “to keep, maintain, preservation, protect” (见 guard (v.) ). 抽象或集体意义上的“a keeping, a custody” (如 bodyguard) 也是15世纪初的剑术和拳术意义上的, 是1590年代的; 因此, 要被 on guard (1640年代) 或 off (one's) guard (1680s). 作为足球阵地, 从1889年开始. Guard-rail 1860年开始考证, 最初是在铁轨上, 外侧在铁轨旁运行; 其. guide-rail 在轨道之间运行.

guard (v.)

15世纪中叶, 来自 guard (n.), 或来自古法语 garder “看守, 守卫, 保护, 维护, 保存” (对应于古北法语 warder, 见 gu-), 来自法兰克语 *wardon, 来自原日耳曼语 *wardon “看守” (来自PIE根 *wer- (3) “感知, 注意” ). 意大利语 guardare, 西班牙语 guardar 也是来自日耳曼语. 相关: Guarded; guarding.

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Definitions of guard from WordNet
1
guard (n.)
a person who keeps watch over something or someone;
guard (n.)
the person who plays that position on a football team;
the left guard was injured on the play
guard (n.)
a device designed to prevent injury or accidents;
Synonyms: safety / safety device
guard (n.)
a posture of defence in boxing or fencing;
keep your guard up
guard (n.)
the person who plays the position of guard on a basketball team;
guard (n.)
a military unit serving to protect some place or person;
guard (n.)
a precautionary measure warding off impending danger or damage or injury etc.;
we let our guard down
Synonyms: precaution / safeguard
guard (n.)
the duty of serving as a sentry;
he was on guard that night
Synonyms: guard duty / sentry duty / sentry go
guard (n.)
(American football) a position on the line of scrimmage;
guards must be good blockers
guard (n.)
a position on a basketball team;
2
guard (v.)
to keep watch over;
there would be men guarding the horses
guard (v.)
watch over or shield from danger or harm; protect;
guard my possessions while I'm away
Synonyms: ward
guard (v.)
protect against a challenge or attack;
Synonyms: defend / hold
guard (v.)
take precautions in order to avoid some unwanted consequence;
guard against infection
guard against becoming too friendly with the staff
From wordnet.princeton.edu