Q&A for How to Say Shut up in Japanese

Arigato means thank you in Japanese so it would not be used to tell someone to shut up.

Arigato is here so that when you get what you asked (which is for someone to shut up) you can reply. For example, if someone is making noise and you tell them 'shizukani shite kudasai' and they say OK or they stop making noise, to show respect, you say 'arigatō' to tell them 'thank you'.

Correct! "Arigato" means "thanks." To express gratitude when someone listens to you, use it to be respectful.

To become fluent in Japanese, practice regularly. Watching anime can help; start with English subtitles, then switch to Japanese audio to improve your understanding. Try speaking Japanese, even if just in your mind, and practice writing it as well.