What does clapperboard mean?
A clapperboard is a hinged device used in film production to synchronize recorded sound with moving images. It consists of two wooden or acrylic boards joined at one end like a hinge; the upper board, called the clapstick or clapper sticks, is snapped sharply down onto the lower one while a camera rolls. The resulting sharp report gives editors a precise audio-visual marker — the moment of contact visible on film matches the spike on the soundtrack, allowing the two to be aligned exactly during editing. The face of the clapperboard typically carries handwritten or digitally displayed information identifying the production, the scene number, the take, and often the director and cinematographer. In American practice the device is frequently referred to simply as a slate. Though digital workflows have largely automated synchronization, the clapperboard remains an iconic symbol of filmmaking and is still used on many sets today.
nounA hinged board with two slats that is clapped shut at the start of each film shot to synchronize picture and sound and to identify the scene.
- A hinged device with two flat boards, one bearing written details of the production, scene, and take, which is clapped together in front of the camera to synchronize audio and visual recordings in filmmaking.
"The director called for quiet, and the assistant raised the clapperboard before the take began."
"Before each take, the camera assistant wrote the scene and take number on the clapperboard and held it up to the lens."
"In digital productions, electronic clapperboards display timecode alongside the traditional scene information."
Regular plural formation; the plural appears mainly in contexts discussing equipment collections, historical sets, or multiple productions.
"The studio's props department kept a drawer full of vintage clapperboards from earlier decades."
That iconic snap you see at the start of every movie scene isn't decoration — it lets editors sync sound and picture by finding the exact frame where the two boards meet.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of clapperboard
Clapperboard is a compound of 'clapper,' the striking part of a bell that produces the sound, and 'board,' reflecting its construction from two hinged flat pieces. The element 'clap' traces back through Middle English to Old English 'clæppan,' meaning to strike or thump, a Germanic root related to words such as Dutch 'klappen' and German 'klappen.' The compound arose in the twentieth century alongside the technology of synchronized sound cinema, when snapping two boards together became the standard method of aligning picture and audio tracks. It should not be confused with 'clapboard,' a much older term for riven wooden siding.
How clapperboard is actually used
The word is standard technical vocabulary in British and American filmmaking; in American usage it is often simply called a 'slate' or 'film slate.' The term belongs to professional and enthusiast registers rather than everyday conversation. Note that 'clapboard' (American English) means wooden house siding and is an entirely different word despite its similar spelling.
Easily confused with clapperboard
Clapboard refers to the overlapping wooden siding used on house exteriors, whereas a clapperboard is the filmmaking slate snapped shut on set.