unstep

/ʌnˈstɛp/
verb
  1. To remove (a mast) from its step (the socket or base where it is fixed) on a boat or ship.
    • We unstep the mast each winter to store the boat safely in the shed.
    • The crew had to unstep the mast before passing under the low bridge.
    • He carefully unstepped the mast to replace the worn rigging.
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