twelfth man
 n.— «N.F.L. fans cannot help themselves. So they keep cheering, often disrupting the communications and hard-thought intentions of the visiting offense and becoming, in effect, what Seattle fans and others call the 12th man.» —“For N.F.L., Crowd Noise Has Become a Headache” by John Branch New York Times Sept. 24, 2006. (source: Double-Tongued Dictionary)

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