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
Hekabe	-	Greek Mythology
Kumari	-	Hinduism, Indian, Hindi, Telugu
Ladislas	LAD-i-slaws (English)	History
Dre	-	English
Suresha	-	Hinduism
Trinidad	tree-nee-DHAHD	Spanish