fast adverb - definition in the Learner's Dictionary - Cambridge Dictionaries Online

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English definition of “fast”

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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 Learners Dictionary © Cambridge University Press)
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