hump

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A rounded mass or protuberance, such as the fleshy structure on the back of a camel or of some cattle.
• noun A deformity of the back in humans caused by an abnormal convex curvature of the upper spine.
• noun Vulgar Slang The act or an instance of having sexual intercourse.
• noun A low mound of earth; a hummock.
• noun A mountain range.
• noun Chiefly British A fit of depression; an emotional slump.
• intransitive verb To bend or round into a hump; arch.
• intransitive verb To exert (oneself).
• intransitive verb To carry, especially on the back.
• intransitive verb Vulgar Slang To engage in sexual intercourse with.
• intransitive verb Slang To exert oneself.
• intransitive verb Slang To hurry.
• intransitive verb Vulgar Slang To engage in sexual intercourse.
• idiom (over the hump) Past the worst or most difficult part or stage.

from The Century Dictionary.

• noun A protuberance; a swelling.
• noun Especially— A hunch or protuberance on the back, caused by an abnormal curvature of the spine, or by natural growth: as, a man with a hump; a camel with two humps; the hump on the back of a whale.
• noun In entomology, a projection on the back of a larva, formed by an upward enlargement of a whole segment, which is then said to be humped. Projections of this kind are very common in the larvæ of the Lepidoptera.
• noun A sailors' name for a worthless member of the crew; a green hand.
• noun A long tramp with a load on the back.
• To bend or hunch so as to form a hump, as the back in some kinds of labor, like that of a miner or ditcher, or as cattle in cold or stormy weather.
• To prepare for a great effort; gather (one's self) together; hurry; exert (one's self): as, hump yourself now.
• To huff; vex.
• In cutlery, to round off, as scissors.
• To use great exertion; put forth effort.

from the GNU version of the Collaborative International Dictionary of English.

• noun A protuberance; especially, the protuberance formed by a crooked back.
• noun (Zoöl.) A fleshy protuberance on the back of an animal, as a camel or whale.
• noun (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.
• transitive verb To form into a hump; to make hump-shaped; to hunch; -- often with up.
• transitive verb Slang, Australia To put or carry on the (humped) back; to shoulder; hence, to carry, in general.
• transitive verb Slang, U. S. To bend or gather together for strenuous effort, as in running; to do or effect by such effort; to exert; -- usually reflexively or with it.
• transitive verb (Railroad) to sort freight cars by means of a hump.
• transitive verb Vulgar Slang, U. S. to engage in sexual intercourse with.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A mound of earth.
• noun A rounded mass, especially a fleshy mass such as on a camel.
• noun A deformity in humans caused by abnormal curvature of the upper spine.
• noun UK, slang An act of sexual intercourse.
• noun slang, UK A bad mood, especially in the expression to have the hump.
• noun slang A painfully boorish person.
• verb transitive To bend something into a hump.
• verb transitive, slang To carry something, especially with some exertion.
• verb intransitive, slang To carry, especially with some exertion.
• verb transitive, intransitive To dry-hump.
• verb transitive, slang To have sex with.
• verb intransitive, slang To have sex.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb round one's back by bending forward and drawing the shoulders forward
• noun something that bulges out or is protuberant or projects from its surroundings
• verb have sexual intercourse with