A: You’ve improved a lot. I’m pretty sure you will win this year’s tennis tournament on campus.

B: I hope so. I’ve been practicing really hard because I refuse to let my nemesis eat my lunch again.

Note: This slangy term means “to best someone; to defeat, outwit, or win against someone.” Perhaps it originated from the practice of a school bully taking away other children’s lunches and eating them. It can also be a metaphor for the scenario where a certain company takes away another company’s business or their share of the market.