to hoe, to weed
鎒 centers on working the soil with a blade: hoeing and weeding. It describes the act of cutting or scraping unwanted growth from the ground.
鎒 combines 金 (metal) with 辱, which likely contributes the sound and relates to agricultural work. The character is associated with metal tools for hoeing and weeding.
The left side 金 is metal, and the right side 辱 looks like a person working the soil. Picture a metal hoe blade cutting through weeds.
For ドウ, imagine a farmer hoeing a long row while humming a low 'dough' sound: dough -> ドウ, as the metal blade digs into the earth.