أَيَا قَبْرَ مَعْنٍ، كَيْفَ وَارَيْتَ جُودَهُ؟
O grave of Maʿn, how could you conceal his generosity?
A grave cannot listen or respond. The apostrophe and question convey grief and pain over Maʿn's death rather than a demand for literal information.
Qabra is an accusative vocative in an iḍāfah construction; Maʿnin is its genitive complement. Wārayta is a past-tense verb treating the grave as an addressee, intensifying the speaker's mourning.