Old English þaccian

← English thwack (link)

← English tangent (link)

← Proto-Germanic *þakwōną (inherited)

← Proto-West Germanic *þakkōn (inherited)

← Proto-Indo-European *teh₂g- (derived)

← Icelandic þjökka (cognate)

← Icelandic þjaka (mention)

← Latin tangō (cognate)

← Norwegian tjåka (cognate)

← Old Dutch þakolōn (cognate)

→ English tangent (cognate)

→ English thack (inherited)

→ English thwack (inherited)

→ Ancient Greek τάσσω (cognate)

→ Latin tango (mention)