وَاخْفِضْ لَهُمَا جَنَاحَ الذُّلِّ مِنَ الرَّحْمَةِ
Lower toward them the wing of humility out of mercy.
“Ikhfiḍ” is an imperative; “janāḥa” is its accusative object and “al-dhull” the genitive complement. “Lahumā” refers to the parents, while “min al-raḥmah” frames the action as one of mercy.
Humility is imagined in the likeness of a bird lowering its wing. The bird is unspoken, while its characteristic “wing” remains: the classic rationale for an implicit metaphor (istiʿārah makniyyah).