eat someone’s lunch

eat (one's) lunch

slang To defeat one. I've been practicing really hard because I refuse to let my nemesis eat my lunch again.See also: eat, lunch

eat someone’s lunch

tv. to best someone; to defeat, outwit, or win against someone. (In the way that a school bully takes away children’s lunches and eats them at recess.) The upstart ABC Computer Company is eating IBM’s lunch. See also: eat, lunch