Set in motion

verb

Definitions

Verb
  1. 1
    To trigger movement or progress; to get going. idiomatic

    "Considerable excitement was caused on the L.M.S.R. Aberdeen line out of Perth recently when a shunting engine in Perth North goods yard, whose driver and fireman were absent, was accidentally set in motion by a shunter and set off unattended on to the main line."

  2. 2
    get going; give impetus to wordnet

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