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mile a minute, a

Very rapidly, as in She was talking a mile a minute about the accident. This expression, alluding to the literal speed of 60 miles per hour, dates from the mid-1900s, when that speed was considered very fast, but it has survived into times of much greater velocity.

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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.