Etymology
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sibilate (v.)

1650s, from Latin sibilatus, past participle of sibilare "to hiss, whistle" (see sibilant (adj.)). Related: Sibilated; sibilating.

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Definitions of sibilate

sibilate (v.)
pronounce with an initial sibilant;
sibilate (v.)
utter a sibilant;
sibilate (v.)
express or utter with a hiss;
Synonyms: hiss / sizz / siss
sibilate (v.)
make a sharp hissing sound, as if to show disapproval;
Synonyms: hiss / siss / sizz
From wordnet.princeton.edu