laugh up your sleeve
to secretly find something funny:
They're very polite in your presence, but you get the feeling they're laughing up their sleeves.
Thesaurus: synonyms and related words
Laughing and smiling
- amused
- be all smiles idiom
- be in convulsions idiom
- be rolling in the aisles idiom
- be wreathed in smiles idiom
- beam
- bust
- gale
- gales of laughter idiom
- giggle
- giggler
- giggly
- grin
- simper
- smile
- smiley
- smiling
- smilingly
- smirk
- stitch
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