"Put in plain English" is a phrase we use when we want to simplify a complex topic or idea so that it can be understood easily by everyone. There are several synonyms that you can use instead of this phrase, such as "explain in simple terms", "dumb it down", "simplify", "clarify", "make it easy to understand", "break it down", and "translate into everyday language". These phrases can be used interchangeably depending on the context and the audience you are addressing. Whether you are explaining difficult concepts to a child or simplifying a technical jargon for your colleagues, choosing the right words will make your message clearer and more effective.