Where does “замерзти” come from?

замерзти (Ukrainian) comes from Ukrainian замерзнути, from Ukrainian за-, from Ukrainian сила, from Proto-Slavic sila, from Proto-Balto-Slavic séiˀlāˀ, from Proto-Indo-European seh₂i-l-eh₂, from Proto-Indo-European sh₂ey-, from Proto-Indo-European seh₂- — to satiate, satisfy.

Ancestry of “замерзти”, step by step

StepLanguageWordMeaning
1Ukrainianзамерзнутиto freeze, to freeze solid
2Ukrainianза-beyond, behind
3Ukrainianсилаforce; strength
4Proto-Slavicsilastrength, force
5Proto-Balto-Slavicséiˀlāˀstrength, force; soul
6Proto-Indo-Europeanseh₂i-l-eh₂
7Proto-Indo-Europeansh₂ey-to bind, fetter
8Proto-Indo-Europeanseh₂-to satiate, satisfy
Every word from Proto-Indo-European seh₂-Every word from Proto-Indo-European sh₂ey-Every word from Ukrainian за-