यस् [ yas ] [ yas ] Root cl. [4] P. ( Lit. Dhātup. xxvi , 101) [ yāsyati ] ( rarely [ yasati ] cf. Lit. Pāṇ. 3-1 , 71 ; Impv. [ -yayastu ] Lit. RV. ; Gr. also pf. [ yayāsa ] ; aor. [ ayasat ] ; fut. [ yasitā ] , [ yasiṣyati ] ; inf. [ yasitum ] ; ind.p. [ yasitvā ] , or [ yastvā ] ) , to froth up , foam Lit. RV. (cf. √ [ yeṣ ] ) ; to heat or exert one's self Lit. Car. ; to strive after (dat.) Lit. Kāvyâd. ii , 83 (v.l.) : Caus. [ yāsayati ] (aor. [ ayīyasat ] ) Gr.: Desid. [ yiyasiṣati ] Lit. ib. : Intens. [ yāyasyate ] , [ yāyasti ] Lit. ib. ( Ct. Gk. 1 )