Definition of overreact verb from the Oxford Advanced Learner's Dictionary

 

overreact

 verb
verb
BrE BrE//ˌəʊvəriˈækt//
 
; NAmE NAmE//ˌoʊvəriˈækt//
 
Verb Forms present simple I / you / we / they overreact
BrE BrE//ˌəʊvəriˈækt//
 
; NAmE NAmE//ˌoʊvəriˈækt//
 
he / she / it overreacts
BrE BrE//ˌəʊvəriˈækts//
 
; NAmE NAmE//ˌoʊvəriˈækts//
 
past simple overreacted
BrE BrE//ˌəʊvəriˈæktɪd//
 
; NAmE NAmE//ˌoʊvəriˈæktɪd//
 
past participle overreacted
BrE BrE//ˌəʊvəriˈæktɪd//
 
; NAmE NAmE//ˌoʊvəriˈæktɪd//
 
-ing form overreacting
BrE BrE//ˌəʊvəriˈæktɪŋ//
 
; NAmE NAmE//ˌoʊvəriˈæktɪŋ//
 
 
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[intransitive] overreact (to something) to react too strongly, especially to something unpleasant The financial markets overreacted to the news.
See the Oxford Advanced American Dictionary entry: overreact