Meaning of “jam on the brakes” in the English Dictionary

british dictionary

"jam on the brakes" in British English

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jam on the brakes

to use the brakes of a road vehicle suddenly and forcefully:

A motorbike appeared from nowhere and I had to jam on the brakes.

(Definition of “jam on the brakes” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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