The origin of the idiom "laugh up one's sleeve" can be traced back to medieval times when it was customary for people to wear large, loose sleeves. The phrase signifies a hidden or secret amusement, where one suppresses laughter by covering their mouth with their sleeve to avoid drawing attention. It is used to convey a sense of smug or sly amusement, often at the expense of someone else, while attempting to conceal it from others.

What is the origin of the idiom "laugh up one's sleeve" and when to use it?

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to [laugh] up {one's} sleeve

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英語での「 laugh up one's sleeve」の定義と意味

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