sibilate

When an audience is so angry or disapproving that they make a hissing sound, they sibilate. Little kids who are missing their front teeth often sibilate too.

You sibilate to some degree every time you pronounce the letter s — the hissing sound itself is called sibilance, or described as sibilant. When your friend tries to catch your attention in the library by saying, "Psst!" she sibilates. And the librarian sibilates too, when he angrily shushes her with a loud "Shhh!" Sibilate comes from the Latin sibilare, "to hiss or whistle."

Definitions of sibilate
1

v make a sharp hissing sound, as if to show disapproval

Synonyms:
hiss, siss, sizz
Type of:
emit, let loose, let out, utter
express audibly; utter sounds (not necessarily words)

v utter a sibilant

Types:
assibilate
insert a sibilant sound before or after (another sound)
Type of:
emit, let loose, let out, utter
express audibly; utter sounds (not necessarily words)

v express or utter with a hiss

Synonyms:
hiss, siss, sizz
Type of:
mouth, speak, talk, utter, verbalise, verbalize
express in speech

v pronounce with an initial sibilant

Type of:
articulate, enounce, enunciate, pronounce, say, sound out
speak, pronounce, or utter in a certain way

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