To put a stop to something is to ensure that something is prevented or isn't allowed to continue due to you disagreeing with it or being against it in some way. when you 'put a stop to' something you make something end or finish.

1. I intend to implement new measures that will put a stop to time wasting in the office once and for all!
2. Putting a stop to the costly dispute was a priority for us, so we instructed our lawyers to make an out-of-court settlement.
3. The teacher warned some of his students that if they didn't put a stop to their bad behaviour, he would be forced to take disciplinary action.

1. My children are always arguing. I don't know how to put a stop to it. It's driving me crazy.
2. I am starting a petition. I want to put a stop to people parking so close to the school.