A device or part that stops movement, flow, or action; used in mechanical, sports, and everyday contexts.
ドアにストッパーをかけておいてください。
Please put the door stopper on.
この容器にはストッパーが付いていて、液が漏れない。
This container has a stopper, so the liquid won't leak.
I engaged the stopper on the bicycle brake.
The door stopper came loose and the door slammed shut in the wind.
I released the stopper on the casters and moved the desk.
We installed a stopper at the bottom of the stairs so the child wouldn't fall.