1. laughing in a nervous, restrained, or partly suppressed manner
Usage: present participle of ‘titter’

1. the act or sound of nervous, restrained laughter
Usage: gerund form

Examples

• The students were tittering at the teacher’s mistake.
• She couldn’t stop tittering during the serious presentation.
• There was constant tittering from the back row.
• His nervous tittering made everyone uncomfortable.
• The tittering died down when the principal entered.
• They were tittering behind their hands like schoolchildren.