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
Latifa	-	Arabic
Mafalda	mah-FAHL-dah (Italian), mə-FAL-də (Portuguese)	Italian, Portuguese
Clementine	klə-mawn-TEEN	French
Wenona	wə-NON-ə	English (Rare)
Bambrough	['bæmbrə]
Baal	BAY-əl (English), BAYL (English)	Near Eastern Mythology