to zero in
to focus attention: We need to zero in on the client’s exact expectations for this software. Don’t bother with any additional functionality at this stage.
to zip up
to keep something quiet: Keep this matter zipped up will you? It’s still highly confidential.
to zoom in
to magnify an image: Can you zoom in on that part of the picture? I want to read what the poster says.
to focus attention: Let’s now zoom in on the company’s debt problem.
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