to cobble, to patch
靪 centers on repairing worn items, especially leather goods, by patching or cobbling them back together.
靪 combines 革 (leather) with 丁, which likely provides the sound テイ and may suggest the idea of fixing or nailing down, fitting the meaning of patching leather.
Leather 革 gets a nail-like patch 丁: imagine using a small nail-shaped tool to cobble a torn leather shoe.
For テイ, picture a tailor carefully patching leather with a T-shaped tool: T -> テイ, and the leather is mended.