stare someone in the face

verb1

1. •
   To be extremely visible and obvious to someone.

   • 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.
   • , Book I The law […] stares them in the face whilst they are breaking it.