I'm busy
I can't attend to you right now because I'm preoccupied with someone or something else. I'm busy, can it wait? I have a meeting to go to, so tell Ron I'm busy and I'll call him back later.
I'm busy.
Do not bother me now.; I cannot attend to your needs now. Bob: Can I talk to you? Bill: I'm busy. Bob: It's important. Bill: Sorry, I'm busy! Fred: Can you help me with this? Bill: I'm busy. Can it wait a minute? Fred: Sure. No rush.