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English definition of “against the clock”

against the clock

If you do something against the clock, you do it as fast as possible and try to finish it before a certain time.Hurrying and doing things quicklyBusy and active When people do something against the clock, the time they take to do it is recorded, in order to find which person or attempt is the fastest.Watches and clocks
(Definition of against the clock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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