Idioms
nail down (someone or something)
to make certain or sure of something
I am trying to nail down the exact time that the meeting will begin.
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The oldest living thing in existence is not a giant redwood, but a bristlecone pine in the White Mountains of California, dated to be aged 4,600 years old. .. More >>
The oldest living thing in existence is not a giant redwood, but a bristlecone pine in the White Mountains of California, dated to be aged 4,600 years old. .. More >>
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