pick [sb/sth] off, pick off [sb/sth]vtr 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."
slang (kill one by one) (俚语)
逐个杀死
The police sniper picked off the bank robbers one by one.