1. laughed in a nervous, restrained, or partly suppressed manner
Usage: past tense of ‘titter’

Examples

• The students tittered when the teacher mispronounced the word.
• She tittered nervously at his awkward joke.
• The audience tittered at the comedian’s mild humor.
• They tittered behind their hands during the serious presentation.
• He tittered uncomfortably when asked about his mistake.
• The children tittered at the silly cartoon character.