A fantastic idiom to help improve your English base.
"Catch someone at a bad time "
Verb = catch - caught - caught
This means you try to talk with someone when they are too busy or doing something else and have no time to talk.
A. Can I talk to you for a minute?
B. I'm sorry. You caught me at a bad time. I have a meeting right now and I'm late.
A. Did I catch you at a bad time ?
B. I'm sorry, but I'm going out for lunch. I'll call you later.
A. My boss is really grumpy this afternoon. I guess I caught him at a bad time .