“捏一把汗”，中文俗语，字面意思是手心出汗（one’s palm is wet with sweat），形容非常紧张的心情，可以翻译为“ be breathless with anxiety ”或“be in a sweat”。

例句：

看着他往悬崖上爬，大家都捏一把汗。

Watching him climb up the precipice, everybody was breathless with anxiety.

因为国税局一直在问我们最近的财务状况，我的老板捏了一把汗。

My boss is in a sweat because the IRS has been asking questions about our recent finances.