v. 1. To adjust a gun so that it will exactly hit (a target); aim at. Big guns were zeroed in on the enemy fort. American missiles have been zeroed in on certain targets, to be fired if necessary. 2. slang To give your full attention to. The Senate zeroed in on the Latin-American problems. Let's zero in on grammar tonight.
ZERO IN ON
Meaning of ZERO IN ON in English
American idioms English vocabulary. Английский словарь американских идиом. 2012