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. © 2015 Farlex, Inc, all rights reserved.

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 © Farlex 2017
See also: