Definition of "set in motion" []

• To trigger movement, to get going (verb)

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• "For one thing, what if whatever Mrs. Mullin had just set in motion had already gone too far before she and Mr. Mullin headed off to Turkey?"
• "In 1989, the Canada–U.S. Free Trade Agreement set in motion the final process of integration of the automotive market by eliminating by the mid-1990s all remaining tariffs on the flow of parts between the two countries."
• "She often wondered what had been set in motion the first time Peter Hallett laid eyes on her sister."