(~s, synchronizing, ~d)
Note: in BRIT, also use 'synchronise'
If you ~ two activities, processes, or movements, or if you ~ one activity, process, or movement with another, you cause them to happen at the same time and speed as each other.
It was virtually impossible to synchronise our lives so as to take holidays and weekends together...
Synchronise the score with the film action.
...a series of unexpected, ~d attacks.
V-RECIP: V pl-n, V n with n, V-ed