Flare up! flare up! is all the cry, in every square and street —
No other sound salutes your ear, whoe'er you chance to meet
Where'er you ride, or walk, or sit, or breakfast, dine, or sup,
They welcome you or quiz you with "Flare up, my boy! flare up!"
[Fraser's Magazine, April 1834]
1926, in reference to airplane crashes; 1936, "disintegration under stress, mental collapse" [Fitzgerald]; from the verbal phrase, from crack (v.) + up (adv.). The verbal phrase in the meaning "to break up laughing" is by 1967, transitive and intransitive. Its earliest sense was "to praise extravagantly" (as in not all it's cracked up to be).
1560s, "reply in writing," from re- "back, again" + write (v.). The sense of "write again, write a second time" especially in a different form is by 1730. Related: Rewrote; rewritten; rewriting. The newspaper rewrite man, who works up copy for publication from information or stories phoned or sent in by reporters, is recorded from 1901. As a noun, "act of revising copy or a text," from 1926.
"write after, write as a postscript," 1610s, a back-formation from postscript or else from Latin postscribere "write after."