flop downvi phrasalphrasal verb, intransitive: Verb with adverb(s) or preposition(s), having special meaning and not taking direct object--for example, "make up" [=reconcile]: "After they fought, they made up."
informal (lie, sit carelessly) (非正式用语)
猛然躺下或坐下,一屁股坐下
He flopped down on the couch to watch the television.