- 1deafen somebody to make someone unable to hear the sounds around them because there is too much noise The noise of the siren was deafening her.
- 2deafen somebody to make someone deaf
NAmE//ˈdɛfn//[usually passive]Verb Forms present simple I / you / we / they deafen
he / she / it deafens
past simple deafened
-ing form deafening