Why was "tantrum" trending last week?
late 14c., from flasken (c.1300) "to dash or splash" (as water), probably imitative. Related: Flashed; flashing. Sense of "give off a sudden burst of light or flame" is 1540s. Flash flood is from 1940. Flash card is from 1923. Flash cube (remember those?) is from 1965.
1560s, from flash (v.); originally of lightning. Meaning "first news report" is from 1857. Meaning "photographic lamp" is from 1913. The comic book character dates to 1940. Flash in the pan (1809) is from old-style guns, where the powder might ignite in the pan but fail to spark the main charge.
Someone or something that promises great success but soon fails: “The rock group that was all the rage last year turned out to be just another flash in the pan.”
A person or thing that does not fulfill an apparent potential: If he's not a flash in the pan he'll be the best poet we ever had
[1809+; fr the igniting charge in an old gun that goes off in the pan or holder without igniting the main charge]