beg
1. beg, borrow or steal
e.g.: A: I haven't got a pen, sir.
B: Well, beg, borrow or steal one, but don't bother me.
2. I beg (of) you
e.g.: Do it, I beg you!
Don't, I beg of you.
3. I beg to differ
e.g.: A: I think we should adopt the manager's proposals.
B: Well, I beg to differ.