going up and down; 【形式ばった表現】 ascent and descent
〈山の〉 the ascent and descent 《of a mountain》
〈道路の〉 the ups and downs 《of a road》
go up and down 《the stairs》.
読み方 のぼりくだり
Ascent and descent:(道路なら) the ups and downs (of a road):(旅行なら) the up down trips (of a journey); going up and down