
aussteigen
to get off
To leave a vehicle such as a bus, train, or car.
An der nächsten Haltestelle müssen wir aussteigen.
We have to get off at the next stop.
to get off / to drop out
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to get off
To leave a vehicle such as a bus, train, or car.
An der nächsten Haltestelle müssen wir aussteigen.
We have to get off at the next stop.

to drop out
To end participation in a project, organization, or system; to give up an activity.
Er hat beschlossen, aus dem Projekt auszusteigen, weil es ihm zu viel wurde.
He decided to drop out of the project because it became too much for him.

to drop out
To end participation in a game, competition, or round early.
Nachdem er seine besten Karten gespielt hatte, ist er aus der Pokerrunde ausgestiegen.
After he had played his best cards, he dropped out of the poker round.
'Aussteigen' (to get off / to drop out) is a separable verb. The prefix 'aus' goes at the end of the main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Ich steige am Hauptbahnhof aus.
I'm getting off at the main station.
The verb 'aussteigen' (to get off / to drop out) is always used with the preposition 'aus' and the dative. This applies both to vehicles and to projects or systems.
Die Passagiere steigen aus dem Flugzeug aus.
The passengers are getting off the plane.
When referring to vehicles, 'aussteigen' (to get off) is frequently combined with public transport such as 'Bus' (bus), 'Zug' (train), or 'U-Bahn' (subway).
Wir müssen an der nächsten Haltestelle aus dem Bus aussteigen.
We have to get off the bus at the next stop.
When 'aussteigen' (to get off / to drop out) is not used in connection with a vehicle, it means to end an activity or participation. The context, e.g. 'aus einem Vertrag' (out of a contract) or 'aus einem Projekt' (out of a project), makes the figurative meaning clear.
Es ist oft schwierig, aus einem laufenden Vertrag auszusteigen.
It is often difficult to get out of an ongoing contract.
to leave / rely
Both verbs can express leaving a place. „Verlassen“ takes the place directly as an accusative object, while „aussteigen“ specifically refers to leaving a vehicle and is usually used with „aus“. So say „den Zug verlassen“ but „aus dem Zug aussteigen“.

Am Bahnhof stiegen wir aus dem Zug durch die vordere Tür aus.
At the station, we got off the train through the front door.
Am Bahnhof verließen wir den Zug durch die vordere Tür.
At the station, we left the train through the front door.