Definition of prey on/upon someone's mind
- Her growing debts preyed on her mind.
- The thought that he could have done better preyed on his mind.
: spoil, booty
: an animal taken by a predator as food
: one that is helpless or unable to resist attack : victim
: to make raids for the sake of booty
: to seize and devour prey
: to commit violence or robbery or fraud
: on the surface : on it
: thereafter, thereon
: some person : somebody
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