一发千钧

一发千钧 [yī fǎ qiān jūn]

1. ■ hang on by the eyelids; a hundredweight hanging by a hair; a thousand piculs suspended by a single hair; be in grave danger; by the skin of one's teeth; depend on a thread; Everything hangs on a hair.; extremely delicate situation; hang by a hair [thread]; in a most dangerous condition; in a very precarious situation; in imminent peril:

在这一发千钧的时刻 at this critical moment