zero in

phrasal verb·1 sense·particle in

Meanings

1

Focus attention precisely on something

Why “in”? You reach a place and become present there. The train gets in, you check in, or the news comes in.

She zeroed in on the key issue.
She focused her attention precisely on the key issue.
The team zeroed in on the leak.
The team focused attention precisely on the leak.

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She zeroed in on the key issue. What does it mean?

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