The story
From rain + fast (“fixed firmly”, adjective, as in fast asleep).
Etymology from Wiktionary, CC BY-SA 4.0.
rainfast
Today it means: That is not washed off by the rain Full definition →
Today it means: That is not washed off by the rain Full definition →
From rain + fast (“fixed firmly”, adjective, as in fast asleep).
Etymology from Wiktionary, CC BY-SA 4.0.