to become unnecessary / to spare
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to become unnecessary
To become superfluous or no longer necessary because circumstances have changed or a task has already been completed.
Da der Flug gestrichen wurde, erübrigt sich die Fahrt zum Flughafen.
Since the flight was canceled, the trip to the airport has become unnecessary.
The verb is derived from 'übrig' (left over). The prefix 'er-' often points to a result. So 'sich erübrigen' means that something becomes unnecessary as a result, while 'etwas erübrigen' means being able to 'set aside' or spare something from scarce resources.
Da alle zugestimmt haben, erübrigt sich eine weitere Diskussion.
Since everyone has agreed, further discussion is unnecessary.
In the meaning 'to become unnecessary', the verb is always used reflexively: 'sich erübrigen'. The thing that becomes unnecessary is the subject of the sentence.
Eine Erklärung erübrigt sich, ich habe alles gesehen.
An explanation is unnecessary; I saw everything.
In the meaning 'to be able to spare', the verb is used transitively with an accusative object. It usually refers to scarce resources such as time or money.
Ich hoffe, ich kann das Geld für die Reparatur noch erübrigen.
I hope I can still spare the money for the repair.
to save
'sparen' and 'erübrigen' can both have to do with not spending or not needing something. 'sparen' is used when you save money or use less of something. So it describes a deliberate action. 'erübrigen' means either that something is no longer necessary, or that you have some time or money left to spare despite limited resources. Learners may confuse the words because both appear in sentences about money, time, or unnecessary actions. In practical terms: you actively 'sparen'; something 'erübrigt sich' when it is no longer necessary, or you can 'erübrigen' something when you can spare it.
Die lange Diskussion erübrigt sich, weil die Entscheidung schon gefallen ist.
The long discussion is unnecessary because the decision has already been made.
Lisa spart jeden Monat etwas Geld für eine Reise.
Lisa saves some money every month for a trip.