be up to no good

(informal)

if someone is up to no good, they are doing something bad She thinks her husband has been up to no good because she found long blonde hairs on his jacket.

Common Names:

Name	Pronounced	Usage
Rupa	-	Indian, Hindi, Marathi, Bengali, Nepali
Hanke	HAHN-kə	Dutch
Anatolius	-	Ancient Greek (Latinized)
Ieremias	-	Biblical Greek
Mahir	-	Arabic
Rainier	-	French