nail down

US /neɪl daʊn/
UK /neɪl daʊn/
"nail down" picture
1.

to succeed in getting a definite decision or agreement about something

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We need to nail down the exact date for the meeting.
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Can you nail down the details of the contract by tomorrow?
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pin downsettlefinalizesecureconfirm
2.

to force someone to be specific or to make a decision

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The lawyer tried to nail down the witness on the exact time of the incident.
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It's hard to nail him down on a commitment.
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pin downpresscornerforce a decision
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nailnail polishnail filenail bednail scissorsnail varnishnail art