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Turn in on oneself vs Turn oneself in

turn in on oneselfhave as little as possible to do with other people:

  • She has become introverted, turned in on herself, and has broken off contact with the world that she no longer knows.

turn oneself ingive oneself to the police:

  • It seems that Ford’s brother, Rod, had convinced him to turn himself in, although he did not actually realize what Ford had done.

Note: The expression does not correlate in meaning with the phrase turn in—(coll.) go to bed:

  • After we had a late dinner, we decided to turn in for the night.