
außer
except
As a preposition with the dative that indicates an exception; 'excluding'.
Alle waren da, außer meiner Schwester.
Everyone was there except my sister.
except / besides
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except
As a preposition with the dative that indicates an exception; 'excluding'.
Alle waren da, außer meiner Schwester.
Everyone was there except my sister.

out of service
The fixed expression means that a device or facility is not working or is not in use.
Der Fahrstuhl ist leider außer Betrieb.
Unfortunately, the elevator is out of service.

beside oneself
An idiomatic expression meaning that someone is overwhelmed by strong emotions, such as anger, joy, or worry.
Er war außer sich vor Freude, als er die Nachricht hörte.
He was beside himself with joy when he heard the news.

except
As a conjunction, often in the form 'außer dass' (except that) or 'außer wenn' (except if/unless), to introduce a limitation or condition.
Ich komme gerne mit, außer wenn es regnet.
I'd be happy to come along, except if it rains.
The word 'außer' (except/outside) is derived from 'aus' (out) and originally means 'outside'. This origin helps explain its main meaning of 'excluded' or 'not included'.
Alle sind im Haus, außer dem Hund, der ist draußen im Garten.
Everyone is in the house except the dog; it's outside in the garden.
When 'außer' (except) is used as a preposition to name an exception, the following noun or pronoun is always in the dative. This is a fixed rule.
Außer dir kann mir niemand helfen.
No one except you can help me.
The expression 'außer Betrieb' (out of service) is used for technical devices, machines, or facilities that temporarily do not work or cannot be used.
Die Rolltreppe ist schon wieder außer Betrieb.
The escalator is out of service again.
The idiom 'außer sich sein' (to be beside oneself) describes a state of extreme emotional agitation. The reason is often given with 'vor' + dative.
Sie war außer sich vor Wut, als sie die Lüge entdeckte.
She was beside herself with anger when she discovered the lie.
As a conjunction, 'außer' (except) introduces a subordinate clause, often with 'dass' or 'wenn'. 'Außer dass' (except that) introduces a subordinate clause with the verb at the end, while 'außer wenn' (except if/unless) formulates a condition.
Ich weiß nichts über ihn, außer dass er in Berlin wohnt.
I know nothing about him, except that he lives in Berlin.
without
„Ohne“ focuses on the absence of a person or thing. „Außer“, by contrast, names a person or thing as an exception to a group or general statement. If Anna is absent, both can work, but „ohne Anna“ describes the absence, while „außer Anna“ describes the exception.

Alle Gäste kamen außer Anna zur Feier.
All the guests came to the party except Anna.
Alle Gäste kamen ohne Anna zur Feier.
All the guests came to the party without Anna.