βύσμα
From LSJ
οἵτινες πόλιν μίαν λαβόντες εὐρυπρωκτότεροι πολύ τῆς πόλεος ἀπεχώρησαν ἧς εἷλον τότε → after taking a single city they returned home, with arses much wider than the city they captured
English (LSJ)
ατος, τό, (βύω)
A plug, bung, Hp.Mul.2.114 (pl.), Ar.Fr. 299; Στίλπωνος βύσματα Stilpo's stoppers, i. e. arguments with which he stopped his opponents' mouths, Diph.23.