be up to something
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Định Nghĩa và Ý Nghĩa của "be up to something"

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

example
Example
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I think he's up to something because he's been acting very secretive lately.
Why are the children whispering in the corner?
The sudden flurry of activity in the office suggests that the team is up to something big.
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