noun
a sail set above the lowermost sail on a mast of a square-rigged ship
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The sailor climbed up to adjust the topsail in order to catch the wind more efficiently.
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I saw a cool old ship with a massive topsail while I was out on the water.
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Check out the topsail on that yacht, it's huge!
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Raising the topsail of innovation can help propel your business to new heights.