Etymology
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From rain + burn, by analogy with sunburn.
rainburn (uncountable)
- (humorous) A notional burn on the skin caused by excess exposure to heavy rain.
1991 June 13, Mark Grundy, “Plot Seeds/Story: Undead of Purditory”, in rec.games.frp[1] (Usenet):It started with neck and upper body sores that looked a bit like rainburn - but usually they had only two or three of them.
2002 May 31, old dobbin, “wild garlic overdose? (long)”, in uk.rec.equestrian[2] (Usenet):I have seen sunburn/windburn and 'rainburn' affect horses over the years but this did not fit any of those causes […]
2005, Martin Sketchley, Affinity Trap:He peered out, glancing at the sky. 'We'd better get under cover before it starts raining,' he said, breathing heavily. 'We don't want to get rainburn.'
See also
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