Definition of slap down phrasal verb from the Oxford Advanced American Dictionary

 

slap down

 phrasal verb
phrasal verb
 
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Phrasal Verbs

slap somebody/somethingdown

(informal)
 
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to criticize someone in an unfair way, often in public, so that they feel embarrassed or less confident Anyone who dared to complain was immediately slapped down.
See the Oxford Advanced Learner's Dictionary entry: slap down