ASSIBILATE
assibilate
(verb) change into a sibilant; “In the syllable /si/, the /s/ sibilates in Japanese”
assibilate
(verb) insert a sibilant sound before or after (another sound)
Source: WordNet® 3.1
Etymology
Verb
assibilate (third-person singular simple present assibilates, present participle assibilating, simple past and past participle assibilated)
(linguistics, phonetics) To change into or pronounce with the accompaniment of a sibilant sound or sounds.
(linguistics, phonetics) To change by assibilation.
Source: Wiktionary
As*sib"i*late, v. t. Etym: [L. assibilatus, p. p. of assibilare to
hiss out; ad + sibilare to hiss.]
Definition: To make sibilant; to change to a sibilant. J. Peile.
Source: Webster’s Unabridged Dictionary 1913 Edition