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steal someone blind

Also, rob someone blind. Rob or cheat someone mercilessly, as in Ann always maintained that children would steal their parents blind. The allusion here is unclear. Possibly it means stealing everything, including someone's sight. [Mid-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.