a thousand pounds hanging by a single hair; used to describe a situation that is extremely critical or perilous

Literally meaning to hang a heavy weight by a single hair; used to describe a situation of extreme danger or a critical moment. Same as [[千钧一发|千鈞一髮|qian1 jun1 yi1 fa4]].

a weight of a thousand pounds; a heavy burden or an extremely important responsibility

at the critical moment; at a point where a situation is hanging by a thread