to  be  up to something
be
bi
bi
up
ʌp
ap
to
something
sʌmθɪng
samthing

Definition & Meaning of "be up to something"in English

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 

Examples
I think he's up to something because he's been acting very secretive lately. 
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