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English definition of “laugh up your sleeve”

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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.
Translations of “laugh up your sleeve”
in Chinese (Traditional) 竊笑,暗自感到好笑…
in Chinese (Simplified) 窃笑,暗自感到好笑…
(Definition of laugh up your sleeve from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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