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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Although the article is specifically reviewing the Type V auto-inflatable PFD, you should be aware that there are also approved Type III manually inflatable PFDs. The Type III devices are not designed to auto-inflate and must be manually activated.