Meaning of “overreact” in the English Dictionary

"overreact" in British English

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(Definition of “overreact” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"overreact" in American English

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overreactverb [ I ]

us /ˌoʊ·vər·riˈækt/

to react too strongly:

She overreacted when I said she’d made a mistake.
overreaction
noun [ C/U ] us /ˌoʊ·vər·riˈæk·ʃən/

(Definition of “overreact” from the Cambridge Academic Content Dictionary © Cambridge University Press)