プログレッシブ和英中辞典(第4版)の解説
りんきおうへん【臨機応変】
臨機応変に depending on the circumstances
臨機応変の処置をとった
He employed means suited [geared] to the occasion.／He took such steps as the occasion demanded.
事故の現場に着いたら臨機応変に行動するより仕方がない
Once we get to the scene of the accident we'll just have to play it by ear.