| 单词 | guard |
| 释义 | guard v. & n. --v 1. tr. (often foll. by from, against) watch over and defend or protect from harm. 2. tr. keep watch by (a door etc.) so as to control entry or exit. 3. tr. supervise (prisoners etc.) and prevent from escaping. 4. tr. provide (machinery) with a protective device. 5. tr. keep (thoughts or speech) in check. 6. tr. provide with safeguards. 7. intr. (foll. by against) take precautions. 8. tr. (in various games) protect (a piece, card, etc.) with set moves. --n 1. a state of vigilance or watchfulness. 2. a person who protects or keeps watch. 3. a body of soldiers etc. serving to protect a place or person; an escort. 4. US a prison warder. 5. a part of an army detached for some purpose (advance guard). 6. (in pl.) (usu. Guards) any of various bodies of troops nominally employed to guard a monarch. 7. a thing that protects or defends. 8. (often in comb.) a device fitted to a machine, vehicle, weapon, etc., to prevent injury or accident to the user (fire-guard). 9. Brit. an official who rides with and is in general charge of a train. 10. in some sports: a a protective or defensive player. b a defensive posture or motion. Phrases and idioms be on (or keep or stand) guard (of a sentry etc.) keep watch. guard cell Bot. either of a pair of cells surrounding the stomata in plants. guard-rail a rail, e.g. a handrail, fitted as a support or to prevent an accident. guard ring Electronics a ring-shaped electrode used to limit the extent of an electric field, esp. in a capacitor. guard's van Brit. a coach or compartment occupied by a guard. lower one's guard reduce vigilance against attack. off (or off one's) guard unprepared for some surprise or difficulty. on (or on one's) guard prepared for all contingencies; vigilant. raise one's guard become vigilant against attack. Derivatives guarder n. guardless adj. Etymology: ME f. OF garde, garder ult. f. WG, rel. to WARD n. |
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