1. Catch unawares, especially with harmful consequences
   "The economic downturn blindsided many investors"
    
2. Attack or hit on or from the side where the attacked person's view is obstructed
   "The linebacker blindsided the quarterback"

1. The side on which your vision is limited or obstructed
   "The quarterback was sacked from his blind side"

Derived forms: blindsided, blind sides, blindsiding, blindsides

Type of: assail, assault, attack, set on, side, surprise

Encyclopedia: Blindside