to be up to something
be
bi
би
up
ʌp
ап
to
тэ
something
sʌmθɪng
самтинг

Визначення та значення слова «be up to something» англійською мовою

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 

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