Etymology
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hump (n.)

1680s (in hump-backed), of uncertain origin; perhaps from Dutch homp "lump," from Middle Low German hump "bump," from Proto-Germanic *hump-, from PIE *kemb- "to bend, turn, change, exchange" (see change (v.)). Replaced, or perhaps influenced by, crump, from Old English crump.

A meaning attested from 1901 is "mound in a railway yard over which cars must be pushed," which might be behind the figurative sense of "critical point of an undertaking" (1914). By 1957, hump day was in use in reference to the mid-point of a training program or course; it was extended to "Wednesday," as the mid-point of the work-week, by 1987.

hump (v.)

"to bend or raise into a hump," 1840, from hump (n.). Meaning "do the sex act with" is attested from 1785, but the source indicates it is an older word. Related: Humped; humper; humping.

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Definitions of hump
1
hump (v.)
round one's back by bending forward and drawing the shoulders forward;
Synonyms: hunch / hunch forward / hunch over
hump (v.)
have sexual intercourse with;
Synonyms: sleep together / roll in the hay / love / make out / make love / sleep with / get laid / have sex / know / do it / be intimate / have intercourse / have it away / have it off / screw / fuck / jazz / eff / lie with / bed / have a go at it / bang / get it on / bonk
2
hump (n.)
something that bulges out or is protuberant or projects from its surroundings;
the hump of a camel
Synonyms: bulge / bump / swelling / gibbosity / gibbousness / jut / prominence / protuberance / protrusion / extrusion / excrescence
From wordnet.princeton.edu