What is the meaning of the whole nine yards?

Perhaps the length of an ammunition belt; means all, everything.

Barry Goldsmith
3
 
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APABarry Goldsmith. (2010). the whole nine yards. Retrieved September 26, 2026, from http://smartdefine.org/the_whole_nine_yards/definitions/1165129
ChicagoBarry Goldsmith. 2010. "the whole nine yards" http://smartdefine.org/the_whole_nine_yards/definitions/1165129 (accessed September 26, 2026).
HarvardBarry Goldsmith 2010, the whole nine yards, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/the_whole_nine_yards/definitions/1165129>.
MLABarry Goldsmith. "the whole nine yards" 21 October 2010. Web. 26 September 2026. <http://smartdefine.org/the_whole_nine_yards/definitions/1165129>