To prey on

Related to To prey on: predatorily, fallen prey, predated
To take prey from; to despoil; to pillage; to rob
To seize as prey; to take for food by violence; to seize and devour.
- Shak.
To wear away gradually; to cause to waste or pine away; as, the trouble preyed upon his mind.
- Shak.

See also: Prey, Prey, Prey

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.