Xinhua indexes 亡 under the 亠 (lid) radical, picking the top dot-and-stroke as the anchor. In oracle bone forms the cap was a hiding figure's head; the modern silhouette has converged on a clean 亠 lid that serves as the dictionary handle.
A single bent stroke functioning as an abstract marker beneath the lid above — together they form the fused silhouette that has carried the meaning to flee, perish, lose since the earliest forms. Historically the lower hook traced a person ducking out of sight.
