I'll put a stop to that
I will intervene to ensure that something unpleasant stops happening. A: "Sounds like those kids are playing basketball again." B: "Oh, I'll put a stop to that—it's after midnight!"
I'll put a stop to that.
I'll see that the just-mentioned undesirable activity is stopped. Fred: There are two boys fighting in the hall. Bob: I'll put a stop to that. Sue: The sales force is ignoring almost every customer in the older neighborhoods. Mary: I'll put a stop to that!