free [sth/sb] upvtr 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."
informal (make [sth] available) (非正式用语)
腾出来，空出来
The rental company said all their cars were reserved, but they might be able to free up a sedan in the afternoon.