Meaning of flak jacket

flak' jack"et

Pronunciation: [key]
  1. an armored garment made of steel plates covered by a padded fabric, designed to protect vital parts of the body from shrapnel.
  2. a protective vest, esp. one that is bulletproof. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.