student asking question

What's "so" mean here? Is it commonly used like this?

teacher

Native speaker’s answer

Rebecca

Good question! Actually, "so" is part of the expression "to say so," which means to have the final decision or the right to decide something authoritatively. As a noun, "say-so" means one's agreement, opinion, or assurance. Thus, you can understand "just do this 'cause I say so" to mean something similar "just do this because I [told you to/am making the decision]." Ex: Don't believe everything your teacher says, just because they say so. Ex: If you don't like something, just say so! Ex: The professor said so, so it must be right. Ex: She was a meek girl and didn't do anything without her parents' say-so.

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