set in train

set in train

To start (a sequence of events); to set in motion. Making this announcement will set in train a series of actions that we will not be able to stop, so please consider it carefully.
See also: set, train
Farlex Dictionary of Idioms.
See also:
  • set (something) out
  • set out
  • get (all) set
  • get set
  • be (all) set (to do something)
  • set (one's) hand to
  • set your hand to
  • set about
  • set about (doing something)
  • set about doing