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]
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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.