synchronize
verb (used with object)
to cause to indicate the same time, as one timepiece with another.
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
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"If anything, the most likely scenario is that there was some sort of playing off each other. Maybe — if there was synchronizing — it happened at the grassroots level," he said.
From New York Times ● Jan. 12, 2015