1. PHRASAL VERB
To zero in on a target means to aim at it or move towards it.
- He raised the binoculars again and zeroed in on an eleventh-floor room.
- = home in on
2. PHRASAL VERB
If you zero in on a problem or subject, you give it your full attention.
- Many of the other major daily newspapers have not really zeroed in on the problem.
- = home in on
... Cobuild
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