In Spanish, you would say ‘¡Cállate!’ to tell someone to be quiet. This is the informal command form used among friends or peers. If you want to be more polite or formal, you could say ‘¡Silencio, por favor!’ which translates to ‘Silence, please!’.
‘Cállate’ comes from the verb ‘callar’, which means ‘to silence’ or ‘to quiet down’. It’s often used when someone is being too loud and you want them to stop talking or making noise. It’s important to be mindful of the context and your tone when using this expression, as it can come off as rude if not delivered appropriately.