Where does “kail-” come from?

kail- (Proto-Balto-Slavic) comes from Proto-Indo-European koil-, from Proto-Indo-European ḱei- — to lie with, store, be familiar.

Ancestry of “kail-”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeankoil-safe, unharmed
2Proto-Indo-Europeanḱei-to lie with, store, be familiar
Every word from Proto-Indo-European ḱei- →Every word from Proto-Indo-European koil- →