crack a joke
Make a joke, say something humorous, as in You can count on Grandpa to crack a joke on every occasion. This expression uses the verb to crack in the now obsolete sense of "briskly pronounce" or "boast." [Early 1700s]
|a chattering or flighty, light-headed person.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
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