Meaning of “against the clock” in the English Dictionary

american-english dictionary

"against the clock" in British English

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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.

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.

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

"against the clock" in American English

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against the clock

before a particular time, or within the allowed time:

I was racing against the clock, but I finished the test just before the bell.

(Definition of “against the clock” from the Cambridge Academic Content Dictionary © Cambridge University Press)