Getting Off
Alighting, Disembarking
noun, verbal noun
Descend off the (train) car. You are getting off a train, or a bus, or anything else with wheels.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
「あのジェットコースター、どうだった？」「すっごく良かったから、降車した瞬間にゲロっちゃったよ。」
"What did you think of that roller coaster?" "It was so intense that I threw up right after getting off."