settle down (third-person singular simple present settles down, present participle settling down, simple past and past participle settled down)

  1. To become quiet and calm after a period of disturbance or restlessness.
    It took John a while to settle down after the phone call.
  2. To establish a settled lifestyle, and especially to marry.
    • 1915, George A. Birmingham, “chapter I”, in Gossamer (Project Gutenberg; EBook #24394), London: Methuen & Co., published 8 January 2013 (Project Gutenberg version), OCLC 558189256:
      It is never possible to settle down to the ordinary routine of life at sea until the screw begins to revolve. There is an hour or two, after the passengers have embarked, which is disquieting and fussy.