What is how to say shut up in spanish?

Here are a few ways to say "shut up" in Spanish, with varying degrees of politeness:

Cállate: This is the most common and direct translation. It's generally considered rude, especially if used towards someone you don't know well. Use it with caution. See more on Cállate.
Cállese: This is the formal version of cállate. Use this to tell someone to shut up respectfully and politely. See more on Cállese.
Cierra la boca: This translates to "close your mouth." It's also considered impolite. See more on Cierra%20la%20boca.
Silencio: This simply means "silence." It can be used to ask for quiet, but it can also be a forceful way of telling someone to shut up, depending on the tone. See more on Silencio.
¡No digas nada!: This means "Don't say anything!". It is also an alternative expression in this sense. See more on No%20digas%20nada.

Important Considerations:

Context: The appropriate phrase depends heavily on the context and your relationship with the person you're speaking to.
Tone: Your tone of voice matters just as much as the words you use. Even a seemingly polite phrase can sound rude if said aggressively.
Regional Variations: There might be other regional variations or slang terms that are used to say "shut up" in specific Spanish-speaking countries.