1. Direct onto a point or target, especially by automatic navigational aids
   "The missile system zeroed in on the enemy aircraft";
   - range in, home in, home in on
    
2. Adjust (as by firing under test conditions) the zero of (a gun)
   "He zeroed in his rifle at 200 yards";
   - zero

Derived forms: zeroes in, zeroed in, zeroing in

Type of: adjust, aim, correct, direct, place, point, set, target