- 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.
Origin of blindside
First recorded in 1970–75; v. use of noun phrase blind side
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018