barter
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English > Greek (Woodhouse)
verb transitive
P. and V. ἀλλάσσειν (or mid.), ἀνταλλάσσειν (or mid.), διαλλάσσειν.
take in exchange: P. and V. μεταλαμβάνειν; see also buy, sell.
barter one's life: V. ἀπεμπολᾶν ψυχήν.