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with one arm tied behind one's back

Also, with one hand; with one's eyes closed. Very easily, as in I can assemble that chair with one arm tied behind my back, or I could make a better dinner with one hand, or He can do that puzzle with his eyes closed. All these phrases are hyperbolic. Also see do blindfolded.

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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.