DEAFEN
deafen
(verb) make soundproof; “deafen a room”
deafen, deaf
(verb) make or render deaf; “a deafening noise”
deafen
(verb) be unbearably loud; “a deafening noise”
Source: WordNet® 3.1
Etymology
Verb
deafen (third-person singular simple present deafens, present participle deafening, simple past and past participle deafened)
(transitive) To make deaf, either temporarily or permanently.
(transitive) To make soundproof.
(transitive, rare, dialectal, sometimes, figurative) To stun, as with noise.
Source: Wiktionary
Deaf"en, v. t. [imp. & p. p. Deafened; p. pr. & vb. n. Deafening.]
Etym: [From Deaf.]
1. To make deaf; to deprive of the power of hearing; to render
incapable of perceiving sounds distinctly.
Deafened and stunned with their promiscuous cries. Addison.
2. (Arch.)
Definition: To render impervious to sound, as a partition or floor, by
filling the space within with mortar, by lining with paper, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition