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
Mina (1)	MEE-nə (English), MEE-nah (Dutch, Limburgish)	English, Dutch, Limburgish
Tryphaina	-	Biblical Greek, Ancient Greek
Tanner	TAN-ər	English
Moisey	mah-ee-SYAY	Russian
Roydon	ROI-dən	English (Rare)
Hendrina	-	Dutch