Etymology
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deafen (v.)

1590s, "to make deaf," from deaf + -en (1). The earlier verb was simply deaf (mid-15c.). For "to become deaf, to grow deaf," Old English had adeafian (intransitive), which survived into Middle English as deave but then took on a transitive sense from mid-14c. and sank from use except in dialects (where it mostly has transitive and figurative senses), leaving English without an intransitive verb here. Related: Deafened.

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Definitions of deafen

deafen (v.)
be unbearably loud;
a deafening noise
deafen (v.)
make soundproof;
deafen a room
deafen (v.)
make or render deaf;
a deafening noise
Synonyms: deaf
From wordnet.princeton.edu