Bifrost a leg up back stairs bascule bridge bateau bridge bridge cantilever bridge catwalk chance clear stage companion companionway doorstep drawbridge escalier fair field fair game fire escape flight of steps floating bridge flyover footbridge footrest footstep gangboard gangplank gangway incline landing landing stage liberty lift bridge occasion opening opportunism opportunity overbridge overcrossing overpass perron place pontoon bridge ramp rest riser room rope bridge round rundle rung scale scope span spiral staircase spoke stair staircase stairs stairway stave step step stool stepping-stones steps stepstone stile string suspension bridge swing bridge time toll bridge tread treads and risers viaduct