Etymology
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ally (n.)
late 14c., "relative, kinsman" (a sense now obsolete), from ally (v.); mid-15c. in the sense of "one united with another by treaty or league." Allies as the name of the nations aligned against the Central Powers in World War I is from 1914; as the nations aligned against Germany, Italy and Japan in World War II, from 1939.
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Stuka (n.)
German dive bomber of World War II, 1940, from German shortening of Sturzkampfflugzeug, from Sturz "fall" + Kampf "battle" + Flugzeug "aircraft."
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mortified (adj.)

"deeply humiliated," 1717, past-participle adjective from mortify. Earlier it meant "dead to sin or the world" (early 15c.); "gangrenous" (late 14c.).

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briefing (n.)
"fact or situation of giving preliminary instructions," 1910 (but popularized by World War II pre-flight conferences), verbal noun from brief (v.).
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demob (v.)

1919, short for demobilize. Originally in reference to troops returning to civilian life at the end of World War I. Related: Demobbed.

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stateside (adj.)
also state-side, 1944, World War II U.S. military slang, from the States "United States" (see state (n.2)) + side.
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offensive (n.)

1720, the offensive, "condition of attacking, an aggressive action or course," from offensive (adj.). Military sense of "forceful action toward a particular end" is by 1918, from World War I.

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hypnopedia (n.)
also hypnopaedia, "sleep-learning," 1932, in "Brave New World," from hypno- "sleep" + ending derived from Greek paideia "education," from pais (genitive paidos) "child" (see pedo-).
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yardbird (n.)
"convict," 1956, from yard (n.1) + bird (n.1), from the notion of prison yards; earlier it meant "basic trainee" (World War II armed forces slang).
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liaise (v.)
1928, back-formation from liaison. Said to have been a coinage of British military men in World War I. Related: Liaised; liaising.
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