Wiktionary

1. point blank(Adverb)

   Horizontally (as the angle at which a projectile is launched); directly or straight (at the target).

2. point blank(Adverb)

   Directly; bluntly; without pretense or caution.

3. point blank(Adjective)

   The distance between a gun and a target such that it requires minimal effort in aiming it. In particular no allowance needs to be made for effects of gravity, target movement or wind in aiming the projectile.