laugh up one's sleeve

laugh up one's sleeve idiom
Rejoice or exult secretly, hide one's amusement, as in When she tripped over her bridal train, her sister couldn't help laughing up her sleeve. This expression replaced the earlier laugh in one's sleeve, used by Richard Sheridan in The Rivals (1775): “'Tis false, sir, I know you are laughing in your sleeve.” The expression, which alludes to hiding one's laughter in big loose sleeves, was already a proverb in the mid-1500s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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