προδιομολογέομαι
From LSJ
ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers
English (LSJ)
A agree in allowing beforehand, Pl.Ti.78a, Arist. Top.108b15; π. τινί c. inf., D.C.38.14; π. ἵνα . . Id.62.21:—Pass., προδιωμολογημένα points conceded on both sides beforehand, v.l. for προσ- in Pl.Sph.241a; ἐκεῖνο προδιομολογείσθω Arist.EN1103b34; τούτου -ομολογηθέντος Ph.1.431.