A stopper is a device or object used to block or prevent movement or flow. It can refer to a physical object, such as a cork or plug, that is inserted into a container to seal it shut, or it can describe a person who halts or impedes progress or action. In sports, a stopper is a player who is skilled at preventing the opposing team from scoring. In everyday language, a stopper can also be used to describe something that brings an end to a situation or activity, such as a stopper in a conversation or a stopper in a plan. Overall, a stopper is something or someone that puts a halt to something else, whether it be physical, metaphorical, or figurative.