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Meaning of “fast” - Learner’s Dictionary

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 fast Tight and tightening
(Definition of fast adverb from the Cambridge Learner’s Dictionary © Cambridge University Press)
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