ἐὰν ᾖς φιλομαθής, ἔσει πολυμαθής → if you are studious, you will become learned
P. and V. ἐκκαλύπτειν (Plato also Ar.), ἀνακαλύπτειν (Xen.), ἀποκαλύπτειν (Plato); see open, disclose.
bare: P. and V. γυμνοῦν.