- a brand of casual shoe with a nonskid sole, designed especially for wear on boats.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for top-sider
kind of casual shoe, 1937, from topside in nautical sense of "upper deck of a ship," where the rubber soles would provide good traction.
Online Etymology Dictionary, © 2010 Douglas Harper