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
But sometimes it fails spectacularly, and people are simply blindsided by
  events such as today's economic crisis.
The chair would surely feel blindsided to learn of the project through hallway
Students should never be blindsided by a negative evaluation.
Everybody was blindsided by the magnitude of what happened.
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