Etymology
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assibilate (v.)

in language, "to change to a hissing sound," 1844, from assimilated form of ad- "to" + sibilant (n.) "hissing sound." Latin assibilare meant "to whisper to." Related: Assibilated; assibilating; assibilation (1850, by 1828 in German, translating Ansausung).

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Definitions of assibilate

assibilate (v.)
insert a sibilant sound before or after (another sound);
assibilate (v.)
change into a sibilant;
From wordnet.princeton.edu