Etymology
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backflip (n.)

"a backwards somersault in the air," 1906; see back (adj.) + flip (n.).

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back-formation (n.)

also back formation, "word formed from an existing word, often by removal of a suffix or supposed suffix," by 1887, from back (adv.) + formation.

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backgammon (n.)
board game for two persons, 1640s, baggammon, the second element from Middle English gamen, ancestor of game (n.); the first element (see back (adv.)) apparently is because pieces sometimes are forced to go "back." Known 13c.-17c. as tables.
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background (n.)
"the ground or situation to the rear of what is in front or most engaging of the attention," 1670s, from back (adj.) + ground (n.); original sense was theatrical, later applied to painting ("part of a picture representing what is furthest from the spectator"), 1752. Figurative sense is first attested 1854.
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backhand (adj.)
1690s, "having the hand turned backward;" see back (adv.) + hand (n.). By 1894 in reference to handwriting that flows at a back-slant. As a verb, by 1857. As a noun, in reference to tennis, 1890, short for backhand stroke or volley. The figurative adjectival sense of "indirect" is from c. 1800. Related: Backhanded; backhanding.
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backhanded (adj.)
1765, "done with the hand turned backward," from backhand (q.v.). Figurative sense "oblique in meaning, indirect; ambivalent, sarcastic," is from 1777. Related: Backhandedly; backhandedness.
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backhoe (n.)

"excavating equipment consisting of a digging bucket on the end of an articulated arm, typically mounted on the back of a tractor," by 1928, from back (n. or adj.) + hoe (n.).

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backing (n.)
1590s, "support at the back;" 1640s, "retreat;" verbal noun from back (v.). Physical sense of "anything placed at or attached to the back of something else" is from 1793. Meaning "musical accompaniment" is recorded from 1937.
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backlash (n.)
1815, of machinery, "reaction of wheels on each other produced by an inconstant load," from back (adj.) + lash (n.) "a blow, stroke." In metaphoric sense, it is attested from 1929.
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backless (adj.)
"without a back," 1919, in reference to women's gowns and dresses, earlier of benches, from back (n.) + -less.
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