(idiomatic) A dangerous person, who is not to be messed with.

(military, chiefly historical) A step or platform dug into the front side of a military trench - allowing soldiers to stand on it in order to fire over the parapet.

(mathematics) A function from the real line to a finite subset of the real line.

(chiefly in the plural) A small effort made towards the completion of a much larger task.

plural of corbie step

(architecture) One of a series of step-like projections at the top of a gable.

(music, US) An interval of which there are seven in a fifth or twelve in an octave, consisting of two tones whose frequency ratio is about 1.059 or 18/17.

(music) An interval equal to two half steps; a major second.

A sudden, discontinuous change.

(military, typically derogatory) A style of march in which the legs advance in turn without bending the knee, whether as a low quick march or a rigorous high slow march for ceremonial occasions; the various drills associated with these marches.