沉住气
Keep control of oneself.

【发音】chén zhù qì

【释义】（在异常情况下）保持头脑冷静，心境平稳。
             Keep calm in mind or be steady in abnormal situation.

【例1】他一看到账单的数字几乎沉不住气了。
           He almost lost control of himself when he saw the size of the bill.

【例2】别惊慌失措的－－沉住气。