be under the gun idiom mainly US
为了在限定时间内（或以限定方式）完成任务而倍感压力
to feel worried because you have to do something by a particular time or in a particular way
Al's under the gun to decide by the end of the month whether to move with his company. 艾爾因需在月底前决定是否和公司一起搬走而倍感压力。