Etymology
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double standard (n.)

in reference to morality and ethics, "rule, principle, or judgment viewed as applying more strictly to one set of people or circumstance than another," 1871; see double (adj.) + standard (n.). Not common before mid-20c. (especially of codes of sexual behavior for women more strict than those for men); earlier it referred to monetary policy and bimetallism (1823). 

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standard (adj.)

1620s, "serving as a standard," from standard (adj.). Earlier it meant "upright" (1530s). Standard-bred "bred up to some agreed-upon standard of excellence" is from 1888.

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double (v.)

c. 1200, doublen, "to make double; increase, enlarge, or extend by adding an equal portion, measure, or value to," from Old French dobler, from Latin duplare, from duplus "twofold, twice as much" (see double (adj.)). Intransitive sense of "to become twice as great" is from late 14c.

From mid-14c. as "to duplicate;" from late 14c. as "to repeat, do twice;" from c. 1400 in the transitive sense of "lay or fold one part of upon another." By 1540s as "to pass round or by." Sense of "turn in the opposite direction" is from 1590s. Meaning "to bend or fold" (a part of the body) is from early 15c.; to double up bodily is from 1814.

A blow on the stomach "doubles up" the boxer, and occasions that gasping and crowing which sufficiently indicate the cause of the injury .... [Donald Walker, "Defensive Exercises," 1840]

Meaning "to work as, in addition to one's regular job" is c. 1920, circus slang, from performers who also played in the band. Related: Doubled; doubling.

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standard (n.1)

mid-12c., "flag or other conspicuous object to serve as a rallying point for a military force," from shortened form of Old French estandart "military standard, banner." According to Barnhart, Watkins and others, this is probably from Frankish *standhard, literally "stand fast or firm," a compound of unrecorded Frankish words cognate stand (v.) and hard (adj.). So called because the flag was fixed to a pole or spear and stuck in the ground to stand upright. The other theory [OED, etc.] calls this folk-etymology and connects the Old French word to estendre "to stretch out," from Latin extendere (see extend). Some senses (such as "upright pole," mid-15c.) seem to be influenced by if not from stand (v.). Standard-bearer in the figurative sense is from 1560s.

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standard (n.2)

"weight, measure, or instrument by which the accuracy of others is determined," late 14c., from standard (n.1) "military standard, banner," a particular use in English of this word, but the sense evolution is "somewhat obscure" [OED]. The standard weights and measures were set by royal ordinance and were known as the king's standard, so perhaps metaphoric, the royal standard coming to stand for royal authority in matters like setting weights and measures. Hence the meaning "authoritative or recognized exemplar of quality or correctness" (late 15c.). Meaning "rule, principal or means of judgment" is from 1560s. That of "definite level of attainment" is attested from 1711 (as in standard of living, 1903).

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double (n.)

late 14c., "an amount twice as great, a twofold quantity or size," from double (adj.). From mid-15c. as "a duplicate copy, something precisely like another."

Sense of "a backward turn to escape pursuers" is from 1590s. Stage sense of "performer or singer fitted to supply the place of a principal in an emergency" is by 1800, originally in opera. The Hollywood stunt double is by 1945. Meaning "an alcoholic drink with twice as much liquor as usual" is by 1922 (double drink is from 1901).  Tennis sense of "game played by two on each side" is by 1884. Baseball sense of "a hit in which the batter safely reaches second base" is by 1938. In betting, double or nothing is by 1899 (double or quit is from 1570s).

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double (adj.)

c. 1300, "twice as much or as large," also "repeated, occurring twice," also "of extra weight, thickness, size, or strength; of two layers," from Old French doble (10c.) "double, two-fold; two-faced, deceitful," from Latin duplus "twofold, twice as much," from duo "two" (from PIE root *dwo- "two") + -plus "more" (see -plus).

From early 14c. as "having a twofold character or relation," also "consisting of two in a set together; being a pair, coupled." From mid-14c. as "characterized by duplicity." The earliest recorded use in English is c. 1200, in double-feast "important Church festival."

Double-chinned is from late 14c.; double-jointed, of persons, is by 1828. Military double time (1833) originally was 130 steps per minute; double quick (adj.) "very quick, hurried" (1822) originally was military, "performed at double time."

The photographic double exposure is by 1872. The cinematic double feature is by 1916. Double figures "numbers that must be represented numerically by two figures" is by 1833. Double-vision is by 1714. Double indemnity in insurance is by 1832; double jeopardy is by 1817. The baseball double play is by 1866.

Double trouble "twice the trouble" is by 1520s; in 19c. America it was the name of a characteristic step of a rustic dance or breakdown, derived from slave dancing on plantations. A double-dip (n.) originally was an ice-cream cone made with two scoops (1936); the figurative sense is by 1940. Double bed "bed made to sleep two persons" is by 1779. Double life "a sustaining of two different characters in life" (typically one virtuous or respectable, the other not) is by 1888.

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double (adv.)

"twice, doubly," late 14c., from double (adj.). Double-dyed "twice dyed, deeply imbued," but usually figurative, "thorough, complete" is from 1660s. To see double "by illusion to see two images of the same object" is from 1650s.

To double check "check twice" is by 1958 (see check (v.1)). Related: Double-checked; double-checking. To double-space (v.) in typing is by 1905. Related: Double-spaced. To double book in reservations is by 1966. To double park "park (a vehicle) parallel to another on the side toward the street" is by 1917. Related: Double-parked; double-parking.

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non-standard (adj.)

also nonstandard, "not average or usual," 1926, from non- + standard. A linguist's value-neutral term for language that is not of the form that is accepted as standard, which was formerly stigmatized as bad or vulgar.

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double-decker (n.)

1835, of ships, "with two decks above the water line;" 1867, of street vehicles, "with two floors;" see double (adj.) + deck (n.).

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