D.C.M. Distinguished Conduct Medal. A piece of bronze which a soldier gets for being foolish.
D.C.P. Divisional Concert Party. An aggregation of would-be actors who inflict their talents on Tommy at half a franc per head.
Defaulter. Not an absconding cashier, but a Tommy who has been sentenced to extra pack drill for breathing while on parade or doing some other little thing like that.
"Dekko." To look; a look at something.
Detonator. A contrivance in a bomb containing fulminate of mercury, which, ignited by a fuse, explodes the charge.
"Deruffs." "Deuxosufs." Tommy's French for "two eggs."
"Dial." Another term of Tommy's for his map, or face.
"Digging in." Digging trenches and dugouts in a captured position.
Digging Party. A detail of men told off to dig trenches, graves, or dugouts. Tommy is not particular as to what he has to dig; it's the actual digging he objects to.
"Dinner up." Dinner is ready.