slap down
slap down {v.}, {slang}
1. To stop (someone, usually in a lower position or job) from doing or saying something, in a rough way or with a scolding; silence.
When Billy talked back, the teacher slapped him down.
2. To put a quick stop to; refuse roughly.
The boss slapped down our idea of taking a nap on the job every afternoon.
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Source: A Dictionary of American Idioms
