I need to pin down a date for the meeting.
pin down
idiomTo identify something (e.g. a decision or plan) clearly or specifically.
The manager asked us to pin down exactly how much the project would cost.
Despite weeks of discussion, the committee struggled to pin down a clear policy that would satisfy all parties involved.
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one could hear a pin drop
Extremely quiet, for example, as during a lull in a normally bustling place or scene, or at a sudden dramatic or tense moment.
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pin money
A relatively small sum of cash kept in one's personal possession for routine expenses or incidental purchases; an amount of money which is not particularly significant.