cover up, take by force, shut
揜 centers on forceful concealment or seizure: covering something up, shutting it away, or taking it by force. The meanings share an idea of aggressive control over an object.
揜 combines 扌 (hand) with 弇, which likely contributes both sound and the idea of covering or shutting. The exact historical development is uncertain.
A hand 扌 beside 弇, which looks like a lid closing over something. Picture a hand forcefully shutting a lid to cover up or seize what is inside.
For エン, imagine the hand ending a struggle by covering the object: end -> エン, as the forceful action finishes.