Where does “круглосуточно” come from?

круглосуточно (Russian) comes from Russian кру́глый, from Proto-Slavic krǫglъ, from Proto-Slavic krǫgъ, from Proto-Indo-European krongʰ-o-, from Proto-Indo-European (s)ker-, from Proto-Indo-European sek- — to cut, cut off, sever.

круглосуточно (Russian): around the clock

Definitions

  1. around the clock

Ancestry of “круглосуточно”, step by step

круглосуточно traces back through two separate lines of ancestry.

via Russian кру́глый

StepLanguageWordMeaning
1Russianкру́глыйround, circular
2Proto-Slavickrǫglъround
3Proto-Slavickrǫgъcircle
4Proto-Indo-Europeankrongʰ-o-—
5Proto-Indo-European(s)ker-to cut off; to turn, bend
6Proto-Indo-Europeansek-to cut, cut off, sever

via Russian су́точно

StepLanguageWordMeaning
1Russianсу́точноdaily (24 hours of the clock)
2Russianсу́точныйdaily, diurnal, round-the-clock
3Russian-ный-ish, -ic, -al, -ed
4Old Church Slavonic-ьнъish, -ic, -al, -ed
5Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Indo-European sek- →Every word from Proto-Indo-European (s)ker- →Every word from Proto-Indo-European krongʰ-o- →