chew [sth] over, chew over [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."
(think about or discuss thoroughly)
详细讨论
David chewed over the matter for a few days before making a decision.