“Sounds great. What's the catch?”
A person you know has offered to sell you her car for a very, very low price. You're excited, but you're suspicious about it because the deal is to good. You say this.
Sounds great. What's the catch?
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This is short for "That sounds great."
Say this when you want to agree with someone's suggestion.
When you make deals with people, sometimes they try to leave a negative point until the end.
A: I think I found a job for you.
B: Oh really? That's great.
A: The catch is, it's in New Jersey.
When someone makes an offer that's "too good to be true", you can say "What's the catch?" suspiciously.