laugh up your sleeve
US /læf ʌp jʊər sliːv/
UK /læf ʌp jʊər sliːv/
1.
rir por dentro, rir às escondidas
to be secretly amused about something, often at someone else's expense
:
•
She tried to keep a straight face, but I could tell she was laughing up her sleeve.
Ela tentou manter a seriedade, mas eu percebi que ela estava rindo por dentro.
•
The politician pretended to be concerned, but everyone knew he was laughing up his sleeve at the public's gullibility.
O político fingiu estar preocupado, mas todos sabiam que ele estava rindo por dentro da ingenuidade do público.