Etymology
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backspace (adj.)

also back-space, 1899, in reference to keyboarding, from back (adv.) + space.

We have had the pleasure of examining one of the 1899 model Hammond typewriters, with the new back-space key. This new feature is certainly an improvement in the machine. [The Phonetic Journal, March 11, 1899]
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backstabber (n.)
also back-stabber, in the figurative sense, 1839, from back (n.) + agent noun from stab (v.). The verb backstab in the figurative sense is from 1925. Related: Backstabbing.
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backstage (n.)

also back-stage, "the area of a theater out of view of the audience," especially in the wings or dressing rooms, 1891; see back (adj.) + stage (n.).

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backstairs (n.)
"stairs at the back of a structure," 1650s, from back (adj.) + stairs (see stair). Figurative use is attested earlier (1640s).
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backstitch (n.)
also back-stitch, 1610s, from back (adj.) + stitch (n.). So called because each stitch doubles back on the preceding one. As a verb from 1720.
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backstop (n.)
1819, "something at the back as a barrier;" see back (adj.) + stop (n.). In U.S. baseball, from 1889, "fence a short distance behind the catcher;" figurative extension to "catcher on a baseball team" is from 1890. The verb is attested from 1956 in the sense of "support." Related: Backstopped; backstopping.
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backstory (n.)
c. 1990, from background story.
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backstreet (n.)
mid-15c., from back (adj.), here perhaps with a sense "inferior, mean, obscure" + street.
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backstroke (n.)
also back-stroke, 1670s, "counter-punch;" see back (adv.) + stroke (n.). From 1876 as a swimming stroke, from back (n.).
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backtalk (n.)
also back-talk, "impertinent retort," 1833; see back (adv.) + talk (n.). Originally often used in literary attempts at Irish or Scottish idiom. To talk back "answer impudently or rudely" is from 1849.
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