hit someone for six

• knock someone for six

From cricket where hitting the ball over the boundary scores of six runs, the maximum for one shot.

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hit someone for six

1. (idiomatic) To affect in a devastating way by some unexpected news.

   When I heard about the accident, it hit me for six.

2. To hit another person very hard.

   When he swore at me again, I couldn't hold back. So, I hit him for six.