the part of one's field of vision, as to the side and rear, where one is unable to see approaching objects.
2.
the side opposite that toward which a person is looking.
Origin
1600-10
Examples from the web for blind side
The eyed side is generally light to dark brown with diffuse small spots and blotches, while the blind side is dusky or white.
The condition causes victims to run into obstacles on the blind side and they are afraid of being in crowded places.
The right blind side is actually more dangerous because trucks and buses make wide right turns.
The mouth is of moderate size and the length of the maxillary on the blind side is less than one-third that of the head.
When parking to the driver's blind side a spotter should be used.
All that would be necessary at the fish market is to pick one scale from each flounder having melanism on the blind side.
He has been tested and re-tested on his blind side and there is no startle or bad fear reaction on that side.
British Dictionary definitions for blind side
blind side
noun
1.
(rugby) the side of the field between the scrum and the nearer touchline
2.
the side on which a person's vision is obscured
verb
3.
(transitive) (US) to take (someone) by surprise
Word Origin and History for blind side
n.
"unguarded aspect," c.1600; see blind (adj.). As a verb, also blind-side, blindside, "to hit from the blind side," first attested 1968, American English, in reference to U.S. football tackles.