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1. verb To startle or surprise someone, as with a piece of information. Tommy totally blind sided me when he told me he was going to prom with my ex-girlfriend.
2. verb To physically strike someone who is not in a position to defend themselves. Come on, ref, isn't that a penalty? He totally blind sided me and hit me in the head!
3. noun The side that one is not currently facing. Come on, ref, isn't that a penalty? He totally hit me on my blind side!
4. noun An area that is not able to be seen, either due to its location outside of the field of vision, or due to some physical obstruction or a defect in one's vision. That car must have been on my blind side because I didn't see it coming at all!
side against (one)
To take the opposing side of one in an argument, dispute, or conflict. I'm afraid the board of directors has sided against you in this case—we'll be expecting your resignation directly. You always side against me when your mother starts to criticize me.
See also: side
side with (someone or something)
To join or align with someone or something; to support, favor, or share the opinion of someone or something. The judge sided with the tech company, stating that the plaintiff didn't have enough credible evidence. Sorry, Dave, I'm afraid I have to side with Bill on this issue. It was the only country to side with the rebel group, offering them military and financial aid.
See also: side
see under blind spot.