Nail it down

Meaning: to find out something for certain, or to fix something finally
Example: There was a rumour going around the school that the school was to be permanently closed.  The principal looked into the rumour and nailed down the facts that it wasn't going to be closed.  The tarpaulin that covered the wood pile blew off and the man put
See this Idiom in a story: The Most Unruly Class in the World

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nail it down