Harmonize (4)
'harmonize' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sync that I've seen before include "go together" , "Togetherness (of sound and picture, say)" , "In which things occur simultaneously" , "Relationship when things occur at the same time" , "Agreement in time" .)
'harmonize' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for concur that I've seen before include "Give assent" , "meet" , "See eye to eye" , "Agree, assent" , "Express agreement" .)
'harmonize' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for attune that I've seen before include "Orient" , "Become receptive (to)" , "Acclimatise" , "Harmonise or adapt to idea or music" , "Get used to" .)
'harmonize' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for synch that I've seen before include "agreement" , "work at the same time" .)