Two distinct dimensions appear: “ikhfiḍ” is a directive imperative, while “janāḥ al-dhull” provides an implicit metaphor. One concerns the communicative act; the other presents an ethical quality through a concrete image.
The command does not ask for the lowering of a literal wing. It directs merciful humility toward parents, and the image gives the direction emotional and sensory force.
There is no need to invent a pun or a separate type of restriction in this verse when the wording does not establish one.