on the double
Very quickly, as in You'd better get here on the double. This expression, also put as at the double, came from the military, where it means “double time”—that is, marching twice as fast as normally. [Early 1800s]
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Words nearby on the double
on the chin, on the contrary, on the cuff, on the defensive, on the dot, on the double, on the edge, on the eve of, on the face of it, on the fly, on the fritz
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.