GCIDE(0.00 / 0 votes)Rate this definition: 1  Hump(n.) (Railroad) a portion of a switchyard with a slanting track in which freight cars may coast without an engine and be sorted through a series of switches. 2  Hump(v. t.) (Railroad) to sort freight cars by means of a hump.
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Inflatable Islands. 1 Person Inflatable Island Float. This single Person Inflatable island is for the pool and for the lake. Consider owning one as a companion to a much larger inflatable islands or a separate life raft. Comes with many features which are common to an inflatable island theme.