To furnish with a mast or masts overly tall or heavy.
1838, Benjamin Franklin, Jared Sparks (edit), The works of Benjamin Franklin, Volume 6,The double desire of being able to overtake a weaker flying enemy, or to escape when pursued by a stronger, has induced the owners to overmast their cruisers, and to spread too much canvass; ...
Origin of Overmast
over- + mast
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