SINCE 1828
zero in on
phrasal verb
zeroed in on;
zeroing in on;
zeroes in on
Definition of zero in on
1
: to direct all of one's attention to (someone or something)
Scientists are hoping to zero in on a cure.
2
: to aim something (such as a gun or camera) directly at (someone or something)
The gunner zeroed in on the target.
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