1. past tense and past participle of clap; to applaud by striking the palms of the hands together
Usage: standard past tense form, though 'clapped' is more common in modern usage
2. past tense and past participle of clap; to strike or shut suddenly and loudly
Usage: archaic or dialectal variant

Examples

• The audience clapt enthusiastically at the end of the performance.
• He clapt his hands together to get everyone's attention.
• She clapt the book shut when she finished reading.
• They clapt loudly for the winning team.
• The door clapt shut behind him as he left.