impoverish

verb

1. (transitive)To make poor.
2. (transitive)To weaken in quality; to deprive of some strength or richness.

   “That exuberant crop quickly impoverishes any fertile soil.”

   “To many of us, organized religion is obnoxious. Yet if we throw out the sense of peace, order and joy that flows from religious ritual, we impoverish ourselves.”

3. (intransitive)To become poor.