階かい段だんを上のぼる

expression, godan verb (-ru)

go up the stairs; climb the stairs

Standard expression for ascending stairs on foot.

• エレベーターが混こんでいたので、階かい段だんを上のぼった。

  The elevator was crowded, so I went up the stairs.

• 毎まい朝あさ、駅えきの階かい段だんを上のぼるのが少すこし大たい変へんだ。

  Climbing the stairs at the station every morning is a bit tough.