Definition of shake something out in English:

shake something out

phrasal verb

  • 1Get rid of or abandon an attitude or practice.

    ‘we are going to shake out the old attitudes’
  • 2Sailing
    Unwind or untie a reef to increase the area of a sail.

    • ‘Indeed, given his own preferences, Holderman thought he might actually have reduced sail, or at least left the night's reefs in rather than shaking them out, if only to give himself a little more time to avoid any ice his lookouts spotted.’