lay down
lay down {v.}
1. To let (something) be taken; give up or surrender (something).
The general told the troops to lay down their arms.
He was willing to lay down his life for his country.
Compare: GIVE UP.
2. To ask people to follow; tell someone to obey; make (a rule or principle).
The committee laid down rules about the size of tennis courts.
3. To declare; say positively; say surely; state.
She laid it down as always true that "a fool and his money are soon parted."
4. To store or save for future use, especially in a cellar.
They laid down several barrels of cider.
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Source: A Dictionary of American Idioms