Short for synchronize; to cause to occur or operate at the same time or rate, especially in coordination with something else.
Shortened from synchronize, from Greek syn- (together) and chronos (time). The abbreviated form 'synch' became popular in the mid-20th century, especially in broadcasting and technology.
The term 'lip synch' comes from early television when audio and video signals would drift apart, causing actors' mouths to move out of time with their voices. Today's digital technology has mostly solved this, but the term persists in music and performance.
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