titter - Dictionary definition and pronunciation - Yahoo! Education
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tit·ter  audio  (ttr) KEY 

intr.v.
tit·tered, tit·ter·ing, tit·ters
To laugh in a restrained, nervous way; giggle.
NOUN:
A nervous giggle.
ETYMOLOGY:
Probably imitative

OTHER FORMS:
titter·er(Noun), titter·ing·ly(Adverb)


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