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Top-Sider

[top-sahy-der]
Trademark.
  1. a brand of casual shoe with a nonskid sole, designed especially for wear on boats.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for topsider

top-sider

n.

kind of casual shoe, 1937, from topside in nautical sense of "upper deck of a ship," where the rubber soles would provide good traction.

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Online Etymology Dictionary, © 2010 Douglas Harper