1. Could you give me a minute?
2. (informal) Hang on a sec / Just a sec.
3. Hold on...
4. Let me see/think...
5. I'll be right with you.
6. Bear with me.
7. That'll have to wait.
8. Be patient.
9. Not so fast!
10. Hold your horses!
#9 and #10 are used for cautioning someone to wait and not make a bad decision or take reckless action.

Fact
Alexander graham bell, who invented the telephone, also set a world water-speed record of over seventy miles an hour at the age of seventy two.      .. More >>