GNU Collaborative International Dictionary of English
Found one definition
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Unstep (?), v. t. [1st pref. un- + step.] (Naut.) To remove, as a mast, from its step.
[1913 Webster]
Unstep (?), v. t. [1st pref. un- + step.] (Naut.) To remove, as a mast, from its step.
[1913 Webster]