(1):

(n.) A defense consisting of pointed stakes driven into the ramparts in a horizontal or inclined position.

(2):

(n.) A fluted reamer for enlarging holes in stone; a small milling cutter.

(3):

(v. t.) To protect, as a line of troops, against an onset of cavalry, by opposing bayonets raised obliquely forward.

(4):

(n.) A large and thick pancake, with slices of bacon in it.