Everything; the full extent or all of something.
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To do or include absolutely everything — nothing left out.
When you give something the whole nine yards, you go all the way and hold nothing back.
It’s used to describe a full effort or a complete package where every possible element is included.
"The Full Monty"
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The complete or whole thing with nothing left out, the British equivalent
"Pull out All the Stops"
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Do absolutely everything possible to achieve the very best result
"The Whole Nine Yards"
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Everything included, nothing held back