Definitions

1. noun

A short stick held in each hand to produce the sound of a single hand clapping, often used in silent films and other forms of pantomime.

“The actor used a clapstick to indicate the sound of a door slamming shut.”

2. verb

To use a clapstick to produce a sound effect, especially in a film or theatrical production.

“The sound engineer clapped to indicate that he needed a louder sound effect.”