To get down and stand — to dismount or go down from a higher place and come to a standing position (a somewhat literary expression).
飛行機が滑走路に降り立った瞬間、乗客から歓声が上がった。
The moment the plane touched down on the runway, cheers went up from the passengers.
駅に降り立つと、冷たい風が頬を打った。
When I stepped off at the station, a cold wind hit my cheeks.
空港に降り立ったとき、久しぶりの故郷の匂いがした。
When I landed at the airport, I smelled the scent of home for the first time in a while.
To alight or disembark; to land or set foot on the ground — similar to 'to get off' but more formal or literary.
探検隊は小舟で無人島に降り立った。
The expedition team landed on the uninhabited island by small boat.
彼は丘の斜面を降り立ち、谷底へ向かった。
He descended the slope and headed to the valley bottom.
公演後、役者がステージに降り立つと拍手が鳴り止まなかった。
After the show, when the actor stepped down onto the stage, the applause wouldn't stop.