Proto-Slavic *tukъ

→ Bulgarian тук (inherited)

→ Czech tuk (inherited)

→ Old Church Slavonic тоукъ (inherited)

→ Lower Sorbian tucne (derived)

→ Hungarian toka (derived)

→ Macedonian тук (inherited)

→ Polish tuk (inherited)

→ Russian тук (inherited)

→ Slovak tuk (inherited)