be up to

be up to something

to be doing or planning something, often secretly We think those boys are up to something, or they wouldn't be behaving so suspiciously. (often used in questions) What are you up to in there?

Common Names:

Name	Pronounced	Usage
Aneurin	-	Welsh
Isamu	ee-sah-moo	Japanese
Gilberta	khil-BER-tah (Dutch), jeel-BER-tah (Italian)	Dutch, Italian
Agar	['eiga:]
NebİL	-	Turkish
Breanna	bree-AN-ə, bree-AHN-ə	English