Fag—A cigarette.
Fatigue—Any kind of work except manning the trenches.
Fed up—Tommy's way of saying "too much is enough."
Firing step—A narrow ledge running along the parapet on which a soldier stands to look over the top.
Flare—A star light sent up from a pistol to light up out in front.
Fritz—An affectionate term for our friend the enemy.
Funk hole—A dug-out.
Gas—Any poisonous gas sent across when the wind is right. Used by both sides. Invented by the Germans.
Goggles—A piece of equipment similar to that used by motorists, supposed to keep off tear gas. The rims are backed with strips of sponge which Tommy tears off and throws the goggle frame away.
Go west—To die.