1. 时装表演台;T型台
At a fashion show, the catwalk is a narrow platform that models walk along to display clothes.

2. (楼房、大型建筑外或舞台上方的)狭窄天桥，高空走道
A catwalk is a narrow bridge high in the air, for example between two parts of a tall building, on the outside of a large structure, or over a stage.

1. narrow pathway high in the air (as above a stage or between parts of a building or along a bridge)

2. narrow platform extending out into an auditorium

e.g. models displayed clothes on a catwalk at the fashion show