Idiomatic Expressions/Expressions idioms Hi there, I'd like to know if these two expressions idioms are a quiet different each other. 1. It's my cup of tea/It's my thing; 2.Out of my depth; Actually, I grasp the meaning of the one "It's my cup of tea/thing", though, I'm not quite sure if they're interchangeable. Let me give an examples and then you're going to correct me. A: What do you fancy for? B: I'm fancy going to swimming-pool. We can go together. A:Oh, well. It's not my cup of tea. Can I use: Oh, well. It's out of my depth. If I am wrong, please let me know and correct me. Regards!