καθέψω · kathepsō — LSJ
boil down, in Pass., Dsc. Alex. 6, Plu. Vind. 2.555b; of plants, to be dried up by the sun, cj. in Thphr. HP 7.5.2; of a person, ἡλίῳ -ψεῖσθαι (sic) to be broiled, swelter, Luc. Asin. 25; of a river, to be softened (sweetened) by boiling, D.S. 1.40: Act., -ψοντες ἑαυτούς, by hot baths, Gal. 6.185.
metaph., soften, temper, joined with πραΰνειν, X. Eq. 9.6.
digest, ἀργύριον Ar. V. 795 codd. (prob. καταπέψεις).