catch
n. a drawback.Okay, that sounds good, but what's the catch?There's no catch. It's all on the up and up.
stinger
n. the drawback; the catch; the hitch.Now, here's the stinger.Sounds good, but what's the stinger?
What's the catch?
interrog. “What is the drawback?”; “It sounds good. Are there any hidden problems?”Sounds too good to be true. What's the catch?This looks like a good deal. What's the catch?