laughing matter
see under no joke.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for laughing matter
Historical Examples
There was a hideous jocularity in some of these imperial proceedings, which, however, was no laughing-matter at the time.
The Eighteen Christian CenturiesJames White