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

 

impugn

 verb
verb
BrE BrE//ɪmˈpjuːn//
 
; NAmE NAmE//ɪmˈpjuːn//
 
Verb Forms present simple I / you / we / they impugn
BrE BrE//ɪmˈpjuːn//
 
; NAmE NAmE//ɪmˈpjuːn//
 
he / she / it impugns
BrE BrE//ɪmˈpjuːnz//
 
; NAmE NAmE//ɪmˈpjuːnz//
 
past simple impugned
BrE BrE//ɪmˈpjuːnd//
 
; NAmE NAmE//ɪmˈpjuːnd//
 
past participle impugned
BrE BrE//ɪmˈpjuːnd//
 
; NAmE NAmE//ɪmˈpjuːnd//
 
-ing form impugning
BrE BrE//ɪmˈpjuːnɪŋ//
 
; NAmE NAmE//ɪmˈpjuːnɪŋ//
 
 
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impugn something (formal) to express doubts about whether something is right, honest, etc. synonym challenge There were no real grounds for impugning the decision. Word Origin late Middle English (also in the sense ‘assault, attack physically’): from Latin impugnare ‘assail’, from in- ‘towards’ + pugnare ‘fight’.
See the Oxford Advanced American Dictionary entry: impugn