verb (used with object), blindsided, blindsiding.
Sports. to tackle, hit, or attack (an opponent) from the blind side: The quarterback was blindsided and had the ball knocked out of his hand.
Informal. to attack critically where a person is vulnerable, uninformed, etc.: The president was blindsided by the press on the latest tax bill.

1970–75; v. use of noun phrase blind side Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

also blind-side, blind side; the last, with the meaning "unguarded aspect," is from c.1600; the verb meaning "to hit from the blind side" (written as one word) first attested 1968, Amer.Eng., in ref. to U.S. football.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The findings are the latest to blindside the traditional wisdom that adults cannot acquire vision they never had.
We will not knowingly blindside one another in public and will contact staff prior to a meeting with any questions or issues.
One of them is the elimination of blindside helmet-to-helmet blocks.
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