zero in

verb4

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.
   • Zero in and find a watermark in the image.
2. •
   To concentrate or focus one's attention (on a task).

   • One member of the check fraud team will zero in on the fingerprints.
3. •
   To successfully narrow down a search (for).

   • We have zeroed in on the source of the problem.
   • See if you can zero in on the caller.
4. •
   To converge (on).

   • At the spring sale, everyone zeroed in on the bargain clothes.