The story
- Russian · calque ofкогда рак“when the crawfish whistles (on the mountain)”
- English todaywhen shrimps whistle
Calque of Russian когда рак (на горе) свистнет (kogda rak (na gore) svistnet, “when the crawfish whistles (on the mountain)”)
Etymology from Wiktionary, CC BY-SA 4.0.