sync /sɪŋk/verb 2noun 3forms 6phrases 1 verb2 •to make two or more things match, such as the sound and pictures of a film or the files on two devicesOur cloud storage automatically syncs your files to all your devices.He synced his phone to the laptop to transfer data about the field trip. •To flush all pending I/O operations to disk. noun3 •(informal) Harmony. •Clipping of synchronization or synchrony. •A music synchronization license, allowing the music to be synchronized with visual media such as films. formssunk · synced · synched · synching · syncing · syncs Phrases with sync sync upTo synchronize.