To blindside is to launch a surprise attack, especially one that comes from an obstructed or hidden place. Your video game army might blindside your friend's army, resulting in your victory.

If you come up from behind your brother and shove him, you can say that you blindside him. There is also a more figurative way to blindside someone — simply to do or say something the person is utterly unprepared for. You could blindside your family, for example, by suddenly announcing that you're moving to China. The oldest use of blindside as a verb, around 1968, referred to a football tackle.

Definitions of blindside
  1. verb
    attack or hit on or from the side where the attacked person's view is obstructed
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    type of:
    assail, assault, attack, set on
    attack someone physically or emotionally
  2. verb
    catch unawares, especially with harmful consequences
    “The economic downturn blindsided many investors”
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    type of:
    come upon or take unawares
Word Family

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