Definition & Meaning of "hidden agenda"in English

What is the origin of the idiom "hidden agenda" and when to use it?

The idiom "hidden agenda" originated from the combination of the words "hidden" and "agenda." It refers to a concealed or secret plan, motive, or objective that someone possesses, typically in a situation where they claim to have different intentions or goals. The phrase implies that the individual has ulterior motives or hidden purposes beyond what they openly express, leading to suspicion or mistrust regarding their true intentions.