hang by a hair


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hang by a hair

 and hang by a thread 
1. Lit. to hang by something very thin, such as a thread or a hair. The tiniest part of the mobile hung by a thread, the rest are on plastic cords.
2. and hang on by a hair; hang on by a thread Fig. to depend on something very insubstantial; to hang in the balance. Your whole argument is hanging by a thread. John isn't failing geometry, but his passing grade is just hanging by a hair.
See also: hair, hang

hang by a ˈthread/ˈhair

be in a very uncertain situation: After the operation, his life hung by a thread for several hours.The future of this company hangs by a thread. Unless we get two or three big orders by the end of the month, we’re finished.
See also: hair, hang, thread