Polish brnąć

← Czech břednout (cognate)

← Proto-Balto-Slavic *bird- (inherited)

← Proto-Indo-European *bʰredʰ- (root)

← Proto-Indo-European *bʰrdʰ- (inherited)

← Lithuanian bristi (cognate)

← Proto-Slavic *brьdnǫti (inherited)

← Albanian bredh (cognate)

→ Lithuanian bristi (cognate)

→ Polish dobrnąć (affix)