Comments:An Eastern isogloss; but cf. also WMong. kösür-sün (Kalm. kösrsn) 'dung' = OJ kùswò id.; WMong. kusam 'sediment in a pot after boiling milk' (MGCD 392); Yak. kuha-ɣan, Dolg. kuha-gan 'bad' (Stachowski 159). Kor. has a usual verbal low tone.