ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
sŏrōrĭo: āre, v. n. soror, of the female breasts,
I to grow up or swell together, like two sisters: papillae sororiabant, Plaut. Fragm. ap. Fest. p. 297 Müll.: mammae sororiantes, Plin. 31, 6, 33, § 66.