γελανόω
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)
A brighten, cheer: hence, calm, θυμόν B.5.80.
Greek (Liddell-Scott)
γελανόω: φαιδρύνω, γελανώσας θυμὸν Βακχυλ. 2. 80 (Blass).