Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: synchronization

sync

1 noun
     
sync1 , synch
1

in sync (with something/somebody)

a) if things are in sync, they are working well together at exactly the same time and speed
be/move/work in sync
The two mechanisms have to work in sync.
The soundtrack is not quite in sync with the picture.
b) matching or in agreement:
a celebrity who is in sync with young people's lifestyles
The President is in sync with Thompson's views on many issues.
2

out of sync (with something/somebody)

a) if things are out of sync, they are not working well together at exactly the same time and speed
b) not matching or not in agreement

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