student asking question

What does "up to something" mean??

teacher

Native speaker’s answer

Rebecca

In this context, "up to something" means that someone is doing something secretly. When you ask someone if they are "up to something", you are asking if they are doing something secretly that you are not supposed to know. Ex: I think he is up to something. Let's follow him. Ex: He is a quiet person who is always up to something.

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