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
Nazzareno	-	Italian
Edyta	e-DI-tah	Polish
Haneul	-	Korean
Roydon	ROI-dən	English (Rare)
Marjani	-	Eastern African, Swahili
LinnÉA	lin-NE-ah	Swedish