mow [sb] downvtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
figurative (kill en masse)
撂倒，杀死
大败（对手） dà bài （ duì shǒu ）
Bank robbers mowed down the police with machine guns.