Proto-Slavic *bokъ

→ Belarusian бок (inherited)

→ Czech bok (inherited)

→ Lower Sorbian bok (inherited)

→ Macedonian бок (inherited)

→ Polish bok (inherited)

→ Russian бок (inherited)

→ Serbo-Croatian bok (inherited)

→ Serbo-Croatian бок (inherited)

→ Albanian bokë (derived)

→ Ukrainian бік (inherited)