Bourrelet

French-English Dictionary of Military Terms · 1918 · p. 3

Horse-collar. External swell or thickening (of metal part, shell body, ete.). Lump, or small rise, in ground. Lump blob (of wax, etc.). Rim, flange. Muzzle-swell of gun, Pad, cushion. Collision-mat. [p.72]