percumbo

τὸ ἐμόν γ' ἐμοὶ λέγεις ὄναρ → you are telling me what I know already, you are telling me my own dream

Latin > English (Lewis & Short)

per-cumbo: cŭbŭi, 3, v. n., mentioned as an unused form, Varr. L. L. 9, § 49 Müll.