When it comes to expressing the idea of putting an end to something, there are many synonym options available. Some alternatives to "putting a stop to" include "halting," "ceasing," "terminating," "ending," "discontinuing," and "bringing to a close." Other options might include "quashing," "suppressing," "eradicating," "removing," "nixing," "wrapping up," "finishing," and "cutting off." Which synonym is best to use might depend on the context of the situation at hand, and the tone that the writer or speaker is trying to convey. Ultimately, any of these words could be used effectively to convey the idea of stopping something from continuing.