laugh up (one's) sleeve

To try to hide that one is laughing at someone else. Ron may seem like a nice guy, but he laughs up his sleeve whenever he's around someone he dislikes. The popular kids laugh up their sleeves every time I walk by—it's so infuriating.

Common Names:

Name	Pronounced	Usage
Suman	-	Bengali, Indian, Hindi, Marathi, Telugu, Kannada, Nepali
Oona	OO-na (Irish), O:-nah (Finnish)	Irish, Finnish
Vesa (1)	VE-sah	Finnish
Asaf	-	Hebrew, Biblical Hebrew
Nia (3)	-	English
Zackary	ZAK-ə-ree	English