hump

Concise Oxford English Dictionary © 2008 Oxford University Press:
hump/hʌmp/

▶noun

• 1 a rounded raised mass of earth or land.

• 2 a rounded protuberance on the back of a camel or other animal or as an abnormality on a person's back.

▶verb

• 1 informal, chiefly Brit. carry (a heavy object) with difficulty.

• 2 make hump-shaped.

• 3 vulgar slang have sex with.

– phrases
get (or have) the hump Brit. informal become or be annoyed or sulky.
over the hump informal past the most difficult part of something.

– derivatives
humped adjective,
humpless adjective,
humpy adjective .

– origin C18: prob. rel. to Low Ger. humpe ‘hump’.