Zero in on sth, 集中注意力，火力

In the horse-trading, lawmakers are zeroing in on a plan that would trim the cost of some Senate-approved tax cuts

 

zero in on / [zero in on sb/sth] phr v
to direct all your attention towards a particular person or thing
= home in on
　She immediately zeroed in on the weak point in his argument.
to aim a gun or other weapon towards something or someone