Meaning of “against time/the clock” in the English Dictionary

british dictionary

"against time/the clock" in British English

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against time/the clock

If you do something against time/the clock, you do it as fast as possible and try to finish it before a certain time:

It was a real race against time to get all the costumes sewn for the play.

(Definition of “against time/the clock” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)