zero in

verb

1. To focus one's aim; to zoom in and center (on something).“The pilot zeroed in on the bunker and launched a guided missile.”
2. To successfully narrow down a search (for).“See if you can zero in on the caller.”
3. To concentrate or focus one's attention (on a task).“One member of the check fraud team will zero in on the fingerprints.”
4. To converge (on).“At the spring sale, everyone zeroed in on the bargain clothes.”