on a dime
In a very small space, suddenly, as in That horse is so well trained it can turn on a dime. This expression alludes to the fact that the dime is the smallest-size U.S. coin. [Early 1900s]
|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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