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
Farlex Dictionary of Idioms.

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
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • eat (one's) lunch
  • eat lunch
  • eat somebody's lunch
  • eat someone's lunch
  • eat through
  • eat through (something)
  • eat in
  • eats
  • eat face
  • eat (one's) greens