IPA: /ˌoʊvərˈrɛkʃən/
KK: /oʊvərˈrɛakʃən/
A response that is more extreme than what is necessary or appropriate.
Her overreaction to the small mistake surprised everyone in the meeting.
Overreaction → It is formed from "over-" (meaning excessively) and "react" (from Latin "reactare", meaning to act in response). The word describes an excessive response to a situation or stimulus.
Think of responding 'excessively' ('over-') to something you 'act' upon ('react'). This helps you remember that an overreaction is an exaggerated response.