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centerboard

[ sen-ter-bawrd, -bohrd ]
/ ˈsɛn tərˌbɔrd, -ˌboʊrd /
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noun Nautical.
a pivoted fin keel that can be swung upward and aft within a watertight trunk when not in use.
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The rainy weather could not ________ my elated spirits on my graduation day.
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Also called drop keel.
Compare daggerboard.

Origin of centerboard

An Americanism dating back to 1840–50; center + board
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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