συνωνέομαι
From LSJ
English (LSJ)
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.