giggle

Noun
  1. A foolish or nervous laugh (synset 107142401)
    is a type of: laugh, laughter - the sound of laughing
Verb
  1. Laugh nervously (synset 200030135)
    "The girls giggled when the rock star came into the classroom"
    is a type of: express joy, express mirth, laugh - produce laughter
    same as: titter

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