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