An area high above a stage floor (unseen by the audience)
for the stage crew to access lights, curtains...etc. It is usually narrow and can be dangerous if you screw around up there.

Catwalk floor is a narrow, usually elevated platform used by models to demonstrate clothing and accessories during a fashion show.
Models on the catwalk often use a walk which is like that of a cat, placing one foot directly in front of the other to produce an alluring swagger in which the hips take on a more exaggerated movement.

The line on a woman's shirt that connects her breasts. The fabric is stretched tight over her curves (or just her erect nipples) but is looser in between- hence the line. So-called because of the similarity in appearance to a narrow walkway between two towers.