Etymology
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half-breed (n.)
"person of mixed race," 1760; as an adjective by 1762; from half + breed (n.).
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half-dime (n.)
U.S. silver coin minted from 1792 to 1873; originally half-disme; later form by 1800; from half + dime.
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half-blood (n.)
"person of mixed race," 1826; see half + blood (n.). As an adjective, "born of one parent the same and one different," from 1550s. Half-blooded as an adjective in this sense is from c. 1600.
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half-assed (adj.)
"ineffectual," 1932; "Dictionary of American Slang" suggests it is perhaps a humorous mispronunciation of haphazard. Compare half-hearted.
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half-life (n.)

also half life, 1864, "unsatisfactory way of living," from half + life; the sense in physics, "amount of time it takes half a given amount of radioactivity to decay" is first attested 1907.

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half-baked (adj.)
1620s as "underdone;" colloquial figurative sense of "silly, immature" is from 1855; see half + bake (v.).
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