Derivational etymology, rather simple from the formal point of view since ἔργω has in Homer a variant ἐέργω, parallel to ἑρση / ἑέρση. It requires the change of the consonant (implicit). Semantically, it is astonishing, for dew can hardly shut anything in or impede anything. In fact it probably results from the collocation of the two words in Il. 14.349–351: the earth creates a bed of flowers for Zeus and Hera, which "separates them from the surface of the earth" (ὃς ἀπὸ χθονὸς ὑψόσ’ ἔεργε). This bed of flowers is watered by dew drops dripping from the golden cloud in which they are enveloped. Therefore, the flowers covered with dew "shut in" Zeus and Hera in an irréalités space. This etymology is not mentioned in the Homeric scholia bust probably comes from a Commentary on the Iliad, in which the scholar assumed that, since the words ἔργω and ἑέρση are used next to each other (2 lines apart), this means that they are related. The etymology is is already found in the Etym. Gudianum, which provides a different explanation: what is covered with dew is drowned, therefore stifled, and prevented from breathing