to say whether or not you are guilty of a crime in a court of law
When the judge asks how you plead, you must say "guilty" or "not guilty."
to ask for something that you want very much in an emotional way
The company is pleading with its creditors to save the company following their rejection of a rescue plan.
to argue your position in some matter, especially as a lawyer on behalf of a client in a court of law or other tribunal
He pleaded a convincing case.