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Từ điển Oxford Advanced Learner 8th
rat
rat [rat rats ratted ratting] noun, verb BrE [ræt] NAmE [ræt]
noun
1. a small animal with a long tail, that looks like a large mouse, usually considered a ↑pest (= an animal which is disliked because it destroys food or spreads disease)
•rat poison
•The police are all over town. He's caught, like a rat in a trap.
compare ↑rug rat
2. (informal, disapproving)an unpleasant person, especially one who is not loyal or who tricks sb
•You mean he just walked out on her after fifteen years? What a rat!
see (like rats) deserting/leaving a sinking ship at ↑sink v., smell a rat at ↑smell v.
Word Origin:
Old English ræt, probably of Romance origin; reinforced in Middle English by Old French rat. The verb dates from the early 19th cent.
Example Bank:
•Rats had gnawed through the wires.
•The dog was a useful rat catcher in the warehouse.
•a rat-infested cellar
Derived: ↑rat on somebody ▪ ↑rat on something ▪ ↑rat somebody out
verb (-tt-)
Verb forms: 
Word Origin:
Old English ræt, probably of Romance origin; reinforced in Middle English by Old French rat. The verb dates from the early 19th cent.
See also: ↑rat somebody out
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