Longman Dictionary of Contemporary English homepage

home

4 verb
     
home4

home in on something

phrasal verb
1 to aim exactly at an object or place and move directly to it:
The bat can home in on insects using a kind of 'radar'.
2 to direct your efforts or attention towards a particular fault or problem:
He homed in on the one weak link in the argument.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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