Clipping of synchronization.
"The audio track suffered clipping during sync, causing a noticeable pop at the start of the scene."
In plain English: A sync is when two things happen at exactly the same time to match up perfectly.
"The lack of sync between the audio and video made the movie difficult to watch."
make synchronous and adjust in time or manner
"Let's synchronize our efforts"
To synchronize, especially in the senses of data synchronization, time synchronization, or synchronizing music with video.
"The editor synced the audio track with the video footage to ensure perfect alignment."
In plain English: To sync means to make two things happen at exactly the same time so they match up perfectly.
"The two phones did not sync, so my contacts were missing from your device."
Usage: Use sync as an informal verb to mean making two things happen at exactly the same moment, such as matching audio tracks to a video file. This term is commonly used in technology and media contexts rather than for general coordination of unrelated events.
The word sync is a clipped form of the longer term synchronization. It entered English as a shortened version to make communication faster and easier.