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Meaning of horse-collar

horse-col•lar

Pronunciation: (hôrs'kol"ur), [key]
— Slang. Slang.
—n.
  1. (esp. in baseball) a score of zero.
—v.t.
  1. to prevent (an opposing baseball team or batter) from scoring or making a base hit.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.