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Từ điển Oxford Advanced Learner 8th
dumb
dumb [dumb dumber dumbest] adjective, verb BrE [dʌm] NAmE [dʌm]
adjective (dumb·er, dumb·est)
1. (old-fashioned, sometimes offensive)unable to speak
•She was born deaf and dumb. Dumb used in this meaning is old-fashioned and can be offensive. It is better to use speech-impaired instead.
2. temporarily not speaking or refusing to speak
•We were all struck dumb with amazement.
•We sat there in dumb silence.
3. (informal, especially NAmE)stupid
•That was a pretty dumb thing to do.
•If the police question you, act dumb (= pretend you do not know anything).
•In her early movies she played a dumb blonde.
Word Origin:
Old English, of Germanic origin; related to Old Norse dumbr and Gothic dumbs ‘mute’, also to Dutch dom ‘stupid’ and German dumm ‘stupid’.
Example Bank:
•I'm sure my question sounded really dumb.
•She sat there, dumb with rage.
•They were struck dumb by some sort of shock.
•They were struck dumb with amazement.
•Don't be so dumb!
•His new girlfriend is a classic dumb blonde.
•How could he be so dumb as to do that?
•I must have sounded really dumb.
•If the police question you, act dumb
•She was born deaf and dumb.
•She's going out with some dumb jock from her high school.
•That's the dumbest idea I ever heard.
•This president is even dumber than his father.
•We all sat there in dumb silence.
•a stupid/silly/foolish/dumb mistake
Derived Words: ↑dumbing down ▪ ↑dumbly ▪ ↑dumbness
Derived: ↑dumb down ▪ ↑dumb something down
verb
Verb forms: 
Word Origin:
Old English, of Germanic origin; related to Old Norse dumbr and Gothic dumbs ‘mute’, also to Dutch dom ‘stupid’ and German dumm ‘stupid’.
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