Answer: synch

AnswerCrossword Clue
SYNCHMatched, after "in"
synchto cause to operate in unison, also SYNC
synchsynchronize
SYNCHMatch (up)
SYNCHOut of ... (not together)
SYNCHFilm dubber's concern
SYNCHHarmonize
SYNCHAccord
SYNCHCoordinate
SYNCHMesh
SYNCHGet coordinated, slangily
SYNCHLip-...
SYNCHOut of .... (not together)
SYNCHTogetherness
SYNCHHarmony
SYNCHHarmonious relationship
SYNCHLip ...: mouth the words
SYNCHHarmony, briefly
SYNCHMatch precisely, for short