συνωνέομαι

A. buy together, collect by purchase, νησιῶται ἵππον συνωνέονται μυρίην Hdt. 1.27.

II. buy up, σῖτον Lys. 22.6, X. HG 5.4.56; μαθήματα Pl. Sph. 224b; θηρία Plu. Brut. 21:—Pass., προσέταξεν [χρυσὸν] συνωνηθῆναι POxy. 2106.4 (iv A.D.):—the pf συνεώνημαι is used as Pass., ὁ συνεωνημένος [σῖτος] corn bought up, Lys. 22.12; but with act. sense in D. 13.30, 23.208.

III. assist one to buy, Thphr. Char. 2.7.