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English definition of “put your foot down”

put your foot down

C2 to use your authority to stop something happening: When she started borrowing my clothes without asking, I had to put my foot down. UK (US floor it) to increase your speed when you are driving: The road ahead was clear, so I put my foot down.
(Definition of put your foot down from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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