Etymology
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blind side (n.)

"weak or unguarded aspect of a person or thing," c. 1600; see blind (adj.). As a verb, also blindside, "to hit from the blind side," first attested 1968, American English, in reference to U.S. football tackles.

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Definitions of blind side

blind side (n.)
the side on which your vision is limited or obstructed;
From wordnet.princeton.edu