Etymology
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write-up (n.)

1882, from the verbal phrase; see write (v.) + up (adv.).

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link-up (n.)

"a joining together or coupling," 1945, from the verbal phrase; see link (v.) + up (adv.).

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seven-up (n.)

1830 as the name of a children's game (OED describes it as "all-fours" when played for seven "chalks"); with capital initials, as the proprietary name of a brand of carbonated drink, it is attested from 1928.

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show up (v.)

verbal phrase, by 1826 as "to disgrace through exposure;" see show (v.) + up (adv.). The meaning "to put in an appearance, be (merely) present" is by 1888. The noun sense of "an exposure of something concealed" is by 1830, colloquial.

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tune-up (n.)

"adjustments made to an automobile to improve its working," 1911, from verbal phrase tune up "bring to a state of effectiveness," 1718, in reference to musical instruments, from tune (v.) + up (adv.). Attested from 1901 in reference to engines. Meaning "event that serves as practice for a later one" is from 1934, U.S. sports jargon.

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beef up (v.)

"add strength," 1941, from college slang, from beef (n.) in slang sense of "muscle-power" (1851).

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clean-up (n.)

also cleanup, 1856, "act of cleaning up,  a general cleaning," from clean + up. Meaning "a profit" is recorded from 1878. Verbal phrase clean up "make a large profit" is from 1929. The adjective, in the baseball sense, is recorded by 1910 in reference to the hitter who bats fourth in the lineup: His job is to drive in runs by scoring the players who hit before him and thus "clean up" the bases.

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heads-up (adj.)

"clever, alert," 1926, from warning cry "heads up!" (i.e. "look up!"). As a noun, "a notification, a warning," by 1988.

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push-up (n.)

also pushup, type of physical exercise (originally done on parallel bars), 1893, from the verbal phrase (by 1660s); see push (v.) + up (adv.). As an adjective, "that pushes up or may be pushed up," from 1892; of bras from 1957. Related: Push-ups

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paste-up (n.)

1930, in printing, "a plan of a page with the position of text, illustrations, etc. indicated," from verbal phrase; see paste (v.) + up (adv.).

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