slap someone down
phrasal verb with slap verb [ T ] uk/slæp/ us/slæp/ -pp-
usually disapproving
粗暴地制止（某人）;压制（某人）;断然否决（某人）
to stop someone from talking or making suggestions, often in an unpleasant way
I tried to suggest ways in which the plans could be improved, but he slapped me down. 我试图提出可以改进那些计划的方法，但被他一口否决了。