Taffy - Welsh soldier.
Tapes - Lines of cloth tape laid on the ground to indicate a starting line or the direction of advance.
Teddy bear - Shaggy goatskin winter coat.
Terps - Interpreter.
Terrier -Member of British Territorial Army.
Tickler's - Proprietary brand of jam issued to troops. Also all kinds of jam.
Tic-tac - Signaler.
Tin hat - Steel helmet of any kind.
TM - Trench mortar.
TMB - Trench mortar battery.
Toc Emma - Trench mortar.
Toc H - The Everyman's Club (serviceman's recreation club), located at Poperinghe, near Ypres, in Belgium.
Toffee apple - Stokes mortar bomb. Explosive/gas projectile about the size of a football mounted on a shaft containing the propellant.
Tommy - British soldier.
Tommy-bar - Metal spanner used to open up a Mills bombs for priming.
Tommy-cooker - Alcohol fueled portable cooker for use in Front Line.
Toot sweet - Corrupted form of French - toute suite - immediately.
Tot - Active service rum ration; theoretically about 65ml.
Tour - Time spent by a unit in the line. Usually 4 to 6 days followed by a variable period of rest behind the lines. However, this rest period often included training and fatigue duties such as trench digging, moving munitions and filling sandbags.
Tracer (bullet) - One in every five or so machine-gun bullets which had a phosphorescent insert. This glowed in flight facilitating the correction of the aiming of the gun. Particularly useful at night and for tracking moving targets such as aircraft. It could give away the position of the firer to the enemy.
Tractor - An aircraft with a front mounted propeller. Also a vehicle for moving artillery.
Traverse - Trenches were not straight ditches, since this would have made them far too vulnerable to enfilade fire. Instead, they had traverses built in. These were protrusions of earth or sandbags into the trench, giving a crenelated appearance when viewed from the air. They also reduced the effect of shells when they landed in the trench.
Traversor mat - A mat made of metal mesh used by the infantry for crossing barbed-wire entanglements.
Trench coat - Officer's, waterproofed cotton, knee-length, belted coat.
Trench foot - Pathological degeneration of the skin of the feet brought on by reduced circulation due to long-term immersion in cold water. Infection (wet gangrene) often followed if neglected.
Trooper - Private in cavalry. Also troop-ship.
T (Tappen)-stoff - German toxic gas: xylyl bromide - lacrimator (tear gas) type.
