in the heat of the moment

In the heat of the moment: while in a state of strong emotion or excitement 一时激动之下;一时兴起

I must apologize for the rude things I said yesterday in the heat of the moment.
我必须为我昨天一时激动之下说了粗话道歉.

Take the heat out of sth:缓和局势

The police tried to take the heat out of the situation by withdrawing for a while.
警察暂时撤退,试图缓和一下局势.