←
Old English þyrs (inherited)
←
Middle English þurs (inherited)
←
Middle English thurse (mention)
←
Middle English thyrce (mention)
←
Middle English thurs (mention)
←
Middle English thirs (mention)
←
Proto-Indo-European *tur- (derived)
←
Proto-Indo-European *twer- (mention)
←
Icelandic þurs (cognate)
←
Norwegian tuss (cognate)
←
Norwegian tusse (mention)
←
Norwegian tust (mention)
→
Norwegian Nynorsk tuss (cognate)