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
Phobos	FO-bos (English)	Greek Mythology
Tamanna	-	Indian, Hindi, Bengali
Caterina	-	Italian, Catalan
Ilse	IL-sə (German)	German, Dutch
Sverre	-	Norwegian
Kenanyahu	-	Biblical Hebrew