Meaning of “hang by a thread” in the English Dictionary

british dictionary

"hang by a thread" in British English

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hang by a thread

If a serious situation hangs by a thread, it means that even a slight change can decide what will happen and that a bad result such as death, failure, etc. is likely:

The mayor's political future has been hanging by a thread since the fraud scandal.

(Definition of “hang by a thread” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)