home in on something

Từ điển Oxford Advanced Learner 8th

ˌhome ˈin on sth derived
1. to aim at sth and move straight towards it
•The missile homed in on the target.
•a shark homing in on its victim
2. to direct your thoughts or attention towards sth
•I began to feel I was really homing in on the answer.
•The investigation homed in on the town of Carlton.
Main entry: ↑home_derived