bend over
僂 centers on the physical action of bending the body forward or downward, as in stooping or bowing.
僂 combines the person radical 亻 with 婁, which likely contributes the sound and may relate to the idea of bending or hunching. The exact historical development of 婁 is uncertain.
A person 亻 beside 婁, which looks like a bent figure with a heavy load on top. Imagine someone stooping under a weight.
For ロウ, picture a person bending low to row a boat: low -> ロウ, and the rower's back bends forward.