blind
矇 centers on the condition of being blind, specifically referring to eyes that cannot see or are covered, leading to darkness or lack of sight.
矇 combines 目 (eye) with 蒙, which likely contributes both sound and the idea of covering or obscuring, together suggesting eyes that are covered or blind.
The left side is an eye 目, and the right side 蒙 suggests something covered or obscured. Picture an eye covered by a thick cloth, leaving the person blind.
For モウ, imagine a blind person mowing the lawn by touch: mow -> モウ, and the covered eye 目 on the left reminds you of the blindness.