in sync (with someone or something)

1. Happening, functioning, or moving at the same time and pace as someone or something; simultaneously. Every soldier in the squad marched perfectly in sync. Is it just me, or is the audio not in sync with the movie? It's called "synchronized diving," people! The whole point is to be in sync with your fellow diver, doing the same moves at the same time!

2. Sharing the same or similar goals, ideals, desires, likes, dislikes, etc. with someone; having the same or similar perspectives or opinions as someone. Throughout the date, it just seemed like she and I were totally in sync about everything we brought up. If your team isn't in sync with one another, you're going to have a hard time getting this project done. A: "Is there hope? Will I ever be in sync with my mother-in-law?" B: "Give it time, dear."

in sync

If two things are in sync, they match or happen together as they should. Note: `Sync' is sometimes spelled `synch'. They swayed back and forth, more or less in sync with the music. Mr D and Mr B nodded perfectly groomed grey heads in sync.

in (or out of) sync

working well (or badly) together; in (or out of) agreement.

Sync (or synch ) is an informal abbreviation of synchronization .

1997 Sunday Times The most serious obstacle is the fact that the British economy's cycle is out of sync with Europe.

in/out of ˈsync

(informal) moving or working/not moving or working at exactly the same time and speed as somebody/something else: The soundtrack is not in sync with the picture. ♢ Can we try that part of the dance again? I think we were out of sync.

Sync is a short form of synchronization.