Compound of ᄃᆞᆮ- (tòt-, “to run”) + 니〮다〮 (nítá, “to go”).
ᄃᆞᆮ니〮다〮 (tòtnítá) (infinitive ᄃᆞᆮ녀〮, sequential ᄃᆞᆮ니〮니〮)