Longman Dictionary of Contemporary English homepage

zero

2 verb
     
zero2

zero in on somebody/something

phrasal verb
1 to direct all your attention towards a particular person or thing [= home in on]:
She immediately zeroed in on the weak point in his argument.
2PMW to aim a gun or other weapon towards something or someone
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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