Compositional etymology, prompted by the formal identity of the end of the word ἐρευνάω and the word εὐνή "bed". There is no possible semantic relationship between both. So, the etymologist used a trick, which is the use of a synonym. Εὐνή can be used in poetry to mean "dwelling place". Therefore, it is a place where people διατρίβουσι "spend their time". The noun corresponding to διατρίβω is διατριβή, which allows the etymologist to establish a direct relationship between εὐνή and διατριβή "lifestyle, occupation", since the dwelling place is where the διατριβή takes place. And one of the meanings of διατριβή is "serious occupation, study". Studying often implies asking questions, which allows the etymologist to assume a compound with ἐρέω. The etymology is formally simple, but semantically awkward, involving several approximations, and relationships not explicitly stated