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Meaning of hacking jacket

hack'ing jack"et

Pronunciation: [key]
— Chiefly Brit. Chiefly Brit.
  1. a riding jacket having a tight waist, flared skirt, slanted pockets with flaps, and slits or vents at the sides or back. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.