ἐπέμψατε ἀγγέλους τοῖς ἀλλήλοις ὥστε ἔγνωτε τὸν κίνδυνον → you sent messengers to one another so that you knew the danger
ex-tŭmĕo: ēre, v. n.,
I to swell up: uterum illi numquam extumere, Plaut. Truc. 1, 2, 97.
extŭmĕō, ēre, Pl. Truc. 200, -mēscō, ŭī, ĕre, Apul. Apol. 78, être enflé, s’enfler.