Meaning of “a hair's breadth” in the English Dictionary

british dictionary

"a hair's breadth" in British English

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a hair's breadth

a very small distance or amount:

His finger was within a hair's breadth of touching the alarm.
She came within a hair's breadth of losing her life (= she nearly died).

(Definition of “a hair's breadth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)