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.

'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 fit / suit / pass
'passen' and 'aussteigen' can both occur in games or shared activities when someone does not continue. 'passen' usually only means: I am not taking an action on this turn or in this round, but I am still involved. 'aussteigen' is stronger: I am ending my participation in a game, project, or plan. Learners may confuse the words because both can feel like a no to further action. Remember: someone who 'passt' usually still remains involved. Someone who 'aussteigt' is no longer part of it.

Nach dem Streit steigt sie aus dem Projekt aus.
After the argument, she drops out of the project.
Beim Spiel passt du diese Runde, aber danach bist du wieder dran.
In the game, you pass this round, but after that it’s your turn again.