What does "set in" mean?

  1. Insert, put in, as in I still have to set in the sleeves and then the sweater will be done. [Late 1300s]
  2. Begin to happen or become apparent, as in Darkness was setting in as I left. [c. 1700]
  3. Move toward the shore, said of wind or water, as in The tide sets in very quickly here. [Early 1700s]

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