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Verb: zero in
  1. Direct onto a point or target, especially by automatic navigational aids
    - 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, zeroing in, zeroed in

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