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Chọn ngôn ngữ của từ điển
to be up to something
01
to be involved in a particular activity or to be planning something, often with a sense of secrecy or suspicion
Các ví dụ
I think he's up to something because he's been acting very secretive lately.
Why are the children whispering in the corner? They must be up to something mischievous.
