Word Origin & History
flashlate 14c., from flasken (c.1300) "to dash or splash" (as water), probably imitative. Related: Flashed. Sense of "give off a sudden burst of light or flame" is 1540s, as is the noun. Meaning "photographic lamp" is from 1913. Flash in the pan (1809) is from old-style guns, where the powder might ignite
EXPANDin the pan but fail to spark the main charge. Flash flood is from 1940; flash point (also flashpoint) is from 1878, figurative use by 1955.
flashing1570s, of light; see
flash. Meaning indecent exposure is from 1896. The meaning strip of metal used in roofing, etc. is from 1782, earlier simply flash (1570s), but is of unknown origin and might be an unrelated word.
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