Flare

Definition and stakes

Bern Keating,  The Mosquito Fleet

“ Why hadn’t the gunners opened fire as ordered when the flare went off? And what was the matter on the Jap barge? Why weren’t they tearing us up with their guns, for the flare lit us up as brightly as it illuminated them? ”
Source: Gutenberg

John S. Farmer,  Slang and its analogues past and present…

“ Leman Rede, Sixteen-String Jack, ii., 3. Crissy Odsbuds, I’ll on with my duds, And over the water we’ll flare.
All of a flare, adv. phr. (thieves’) .—Bunglingly.
1839. Brandon, Poverty, Mendicity, and Crime, p. 113. Some of the girls at Milberry’s pick pockets at night: while one talks to the man, the other robs him; but they are not dextrous, they pull it out all of a flare.
Flaring, adj. and adv. (colloquial) .—Excessive: e.g., a flaring lie; flaring drunk; a flaring whore; see Flaming.
Flare-up (or -Out) , subs. (popular) . An orgie; a fight; an outburst of temper. Also a spree.
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Source: Gutenberg

Herbert W. McBride,  The Emma Gees

“ They could not hit him where he was so he just lay still and waited. Suddenly, without warning, they fired a flare light directly over his head. He told me afterward that was the only time he was really scared. ”
Source: Gutenberg

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