eat somebody'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 somebody’s ˈlunch

(American English, business) take away another company’s business or their share of the market: Unless we’re careful, foreign competitors will eat our lunch.
See also: eat, lunch
Farlex Partner Idioms Dictionary
See also:
  • eat (one's) lunch
  • eat lunch
  • eat someone’s lunch
  • eat someone's lunch
  • eat through
  • eat through (something)
  • eat in
  • eats
  • eat face
  • eat (one's) greens