Comments:EAS 71, Doerfer MT 240, Дыбо 14. Despite Doerfer's (TMN 3, 316) doubts, the root is common Altaic. The Jpn. vowel is quite irregular: perhaps in Jpn. and Kor. we should presuppose a suffixed form *sebV-p- ( > Kor. sipɨ-, PJ *sua-p-, with further suffixation *sua-p-ap-). Cf. also WMong. (L 653) sabla-ldu- 'to show favour, be gracious'.