Stare Someone In The Face Meaning

(idiomatic) To be extremely visible and obvious.

Example:   Then, one night you wake up with a start at 3 o'clock in the morning with the answer staring you in the face. Or maybe it hits you in the bath, like Archimedes, or while you're on the loo.
John Locke
  The law […] stares them in the face whilst they are breaking it.