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

 

devoice

 verb
verb
BrE BrE//ˌdiːˈvɔɪs//
 
; NAmE NAmE//ˌdiːˈvɔɪs//
 
Verb Forms present simple I / you / we / they devoice
BrE BrE//ˌdiːˈvɔɪs//
 
; NAmE NAmE//ˌdiːˈvɔɪs//
 
he / she / it devoices
BrE BrE//ˌdiːˈvɔɪsɪz//
 
; NAmE NAmE//ˌdiːˈvɔɪsɪz//
 
past simple devoiced
BrE BrE//ˌdiːˈvɔɪst//
 
; NAmE NAmE//ˌdiːˈvɔɪst//
 
past participle devoiced
BrE BrE//ˌdiːˈvɔɪst//
 
; NAmE NAmE//ˌdiːˈvɔɪst//
 
-ing form devoicing
BrE BrE//ˌdiːˈvɔɪsɪŋ//
 
; NAmE NAmE//ˌdiːˈvɔɪsɪŋ//
 
 
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devoice something (phonetics) to make a speech sound, usually a consonant, voiceless
See the Oxford Advanced American Dictionary entry: devoice