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titter (noun) nervous laugh.
Titter is high voiced nervous laughter. When you are nervous and embarrassed, the laugh you get is a titter.
- The house was filled with titters when the speaker asked them some embarrassing questions. As the audiences knew that they could not answer the question without some embarrassment, they laughed nervously.
- The girl’s constant titter irritated her uncle. Her nervous high-pitched laugh was due to his saying something that embarrassed her.