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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There are a wide variety of zero gravity chairs on the market, each of which have their own features. What this also means though is that there are a variety of costs as well. However, hereâs a list that will give you an idea of what to expect. A regular reclining zero gravity chair will range in price from $40 to $100.