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

 

dumb

 verb
verb
BrE BrE//dʌm//
 
; NAmE NAmE//dʌm//
 
Verb Forms present simple I / you / we / they dumb
BrE BrE//dʌm//
 
; NAmE NAmE//dʌm//
 
he / she / it dumbs
BrE BrE//dʌmz//
 
; NAmE NAmE//dʌmz//
 
past simple dumbed
BrE BrE//dʌmd//
 
; NAmE NAmE//dʌmd//
 
past participle dumbed
BrE BrE//dʌmd//
 
; NAmE NAmE//dʌmd//
 
-ing form dumbing
BrE BrE//ˈdʌmɪŋ//
 
; NAmE NAmE//ˈdʌmɪŋ//
 
 
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Word Origin Old English, of Germanic origin; related to Old Norse dumbr and Gothic dumbs ‘mute’, also to Dutch dom ‘stupid’ and German dumm ‘stupid’. Phrasal Verbsdumb down
See the Oxford Advanced American Dictionary entry: dumb