Meaning of “harm a hair on sb's head” in the English Dictionary

british dictionary

"harm a hair on sb's head" in British English

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harm a hair on sb's head

to hurt someone:

If he so much as harms a hair on her head, I won't be responsible for my actions.

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