Both やめる and とめる means to stop something, however there is a nuance.
止める（やめる）
やめる means “to stop a behavior or action”. This can be translated to “to quit” as well.
止める（とめる）
とめる means “to stop a movement”.
Quiz
1. If you want to stop smoking, how do you say it in Japanese?
2. Let’s say you are visiting Japan and taking taxi right now.
If you want to tell a driver “please drop me off over there (please stop the taxi)”, which one to use?
