raz na ruski rok
//ˈras na‿ˈrus.ki ˈrɔk//
Polishadv
Definitions
- 1.colloquialhumorousonce in a blue moon
Synonyms & related words
Etymology
Literally, “once in [a] Ruthenian year”, in reference to the fact that the Gregorian calendar of most Eastern Slavs has longer months.