←
Old English þēah (inherited)
←
Middle English thaugh (inherited)
←
Middle English thagh (mention)
←
Middle English thogh (mention)
←
West Frisian dôch (cognate)
←
West Frisian dochs (mention)
←
Proto-Germanic *þauh (inherited)
←
Proto-Germanic *-hw (derived)
←
Proto-Indo-European *to- (derived)
←
Proto-Indo-European *-kʷe (derived)
←
Old Norse *þóh (derived)
←
Saterland Frisian dach (cognate)
→
Luxembourgish dach (cognate)
→
Old Irish -ch- (mention)