trigger off

Verb
  1. Put in motion or move to act (synset 201647199)
    "trigger a reaction"; "actuate the circuits"
    causes: come about, fall out, go on, hap, happen, occur, pass, pass off, take place - come to pass
    is a type of: initiate, pioneer - take the lead or initiative in; participate in the development of
    same as: activate, actuate, set off, spark, spark off, touch off, trigger, trip

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