Hypertext Webster Gateway: "sibilate"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sibilate \Sib"i*late\, v. t. & i.
To pronounce with a hissing sound, like that of the letter s;
to mark with a character indicating such pronunciation.
From WordNet (r) 1.7 (wn)
sibilate
v 1: pronounce with an initial sibilant
2: utter a sibilant
3: express or utter with a hiss [syn: {hiss}, {sizz}, {siss}]
4: make a sharp hissing sound, as if to show disapproval [syn:
{hiss}, {siss}, {sizz}]
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