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English definition of “fast”

fast

adverb     /fɑːst/
QUICKLY A2 moving or happening quickly : We ran as fast as we could. You'll have to act fast.Fast and rapidShort in time
fast asleep completely asleep (= sleeping ) Sleep and sleeping
FIRMLY in a firm or tight way: He tried to get away, but she held him fast. → See also thick and fastTight and tightening
(Definition of fast adverb from the Cambridge Learner's Dictionary © Cambridge University Press)

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