sync up

verb syncs up · syncing up · synching up · synced up · synched up

1. ambitransitive, informal, of two or more events To synchronize. Many people believe in menstrual synchrony, the idea that women's menstrual periods sometimes sync up when they work closely together, but the scientific methodology for confirming its existence remains weaker than many assume.
2. ambitransitive, informal, transitive, of two or more events To synchronize (footage) so that the audio and video components play together in correct alignment. You could tell that the video and the audio hadn't been synced up properly, so watching the movie was kind of annoying.