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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mark-up (n.)

also markup, "amount added by a retailer to cover overhead and provide profit," 1899, from the verbal phrase in this sense (by 1870); see mark (v.) + up (adv.).

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grow up (v.)
"advance toward maturity," 1530s, from grow (v.) + up (adv.). As a command to be sensible, from 1951.
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hang up (v.)
c. 1300, "suspend (something) so that it is supported only from above;" see hang (v.) + up (adv.); telephone sense by 1911. The noun hang-up "psychological fixation" is first attested 1959, from notion of being suspended in one place.
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sign-up (n.)
"number who have signed up," 1926, from the verbal phrase; see sign (v.) + up (adv.).
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up-river (prep.)
1773, from up + river. As an adverb from 1848.
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up-to-date (adv.)
1840, "right to the present time," from phrase up to date, probably originally from bookkeeping. As an adjective from 1865. Meaning "having the latest facts" is recorded from 1889; that of "having current styles and tastes" is from 1891.
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back up (v.)
1767, "stand behind and support," from back (v.) + up (adv.). Meaning "move or force backward" is by 1834. Of water prevented from flowing, by 1837.
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build-up (n.)
also buildup, 1927, "accumulation of positive publicity." Of any accumulation (but especially military) from 1943. The verbal phrase is attested from late 14c.; see build (v.) + up (adv.).
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