caught flat-footed
Caught unprepared, taken by surprise, as in The reporter's question caught the President flat-footed. This usage comes from one or another sport in which a player should be on his or her toes, ready to act. [c. 1900]
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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.