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
Iuno	-	Roman Mythology
Acroyd	['ækrɔid]
Germana	-	Italian, Ancient Roman
Behrooz	-	Persian
Jillian	['dʒiliən]
MÓIrÍN	-	Irish