The phrase "new stopper" refers to something or someone that prevents or stops something from happening for the first time. It could be a new person, object, or method that blocks or halts a particular action or process. Full definition
West Ham will press on with Adrian as their No 1 keeper in the 2017/18 season and see signing a new new stopper as a lesser priority! (claretandhugh.info)
If you are like me, my heels tend to need new stoppers oh every forth wear, so make sure you take them to the cobblers well in advance, even if you don't think you will wear them. (inspiringwit.com)
Finally, new stoppers on the rear strut mount insulators and new outer ball joint on the rear stabiliser bar help to improve ride comfort on poor surfaces by minimising vibrations through the suspension. (thekoreancarblog.com)