ἐπέμψατε ἀγγέλους τοῖς ἀλλήλοις ὥστε ἔγνωτε τὸν κίνδυνον → you sent messengers to one another so that you knew the danger
ex-ārĕfīo: ĕri,I v. pass. arefacio, to dry up, become completely dry: fucus marinus, Plin. 26, 10, 66, § 103.