εἰπὼν ἃ θέλεις, ἀντάκουε ἃ μὴ θέλεις → if you say what you want, hear in response what you don't want
P. and V. ὑφαιρεῖν, ὑπεξαιρεῖν, Ar. and P. ὑφαρπάζειν, V. ὑποσπᾶν; see steal.