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The expression against the clock suggests being in a situation where time is limited, and one needs to complete tasks quickly.

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What does the expression against the clock mean?

Working without a deadline

It implies having no time limit, which is not the same as the expression.

Working with ample time

It means having plenty of time, while the expression suggests a lack of time.

Working under time pressure

Working leisurely

It means working in a relaxed or unhurried manner, which is the opposite of the expression.