Hi, from what i understand from your question, "strong word" is a way of describing something more forcefully to show more emphasis. For example, a stronger word for "upset" could be "depressed"; "angry" and "furious", "happy" and "ecstatic" or "elated", "surprised" and "dumbstruck" etc.

Hi Tony 'strong words' is usually a way of describing forceful or contentious speech. It could be language which is very persuasive in favour of a particular point of view or argument. It is often associated with anger, too. If you hear that someone is going to 'put the strong word' on someone else, they are going to speak to them in a very forceful, or even threatening manner, usually to persuade them to do (or stop doing) something.

I have never heard this before, what is the context?