puff out one's cheeks

From LSJ

οἵτινες πόλιν μίαν λαβόντες εὐρυπρωκτότεροι πολύ τῆς πόλεος ἀπεχώρησαν ἧς εἷλον τότεafter taking a single city they returned home, with arses much wider than the city they captured

Source

English > Greek (Woodhouse Extra)

τὰς γνάθους φυσᾶν