
nochmal
again
Means 'noch einmal' (once again) or 'wieder' (again). It expresses the repetition of an action or process.
Könntest du das bitte nochmal wiederholen?
Could you please repeat that again?
again
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again
Means 'noch einmal' (once again) or 'wieder' (again). It expresses the repetition of an action or process.
Könntest du das bitte nochmal wiederholen?
Could you please repeat that again?
'Nochmal' is the colloquial and very common shortened form of 'noch einmal' (once again). In everyday speech, 'nochmal' is almost always used. 'Noch einmal' sounds more formal or emphasizes the repetition more strongly.
Entschuldigung, ich habe das nicht verstanden. Können Sie das nochmal sagen?
Excuse me, I didn't understand that. Can you say it again?
As an adverb, 'nochmal' usually stands in the middle field of the sentence, that is, after the conjugated verb and often also after the subject.
Ich muss dich nochmal etwas fragen.
I need to ask you something again.
'Nochmal' is very often used in requests and commands to ask for a repetition. It can also pick up a thought again or summarize and confirm information.
Mach die Übung bitte nochmal, sie war nicht ganz richtig.
Please do the exercise again; it wasn't quite right.
again / back
Wieder and nochmal both refer to repetition. Nochmal makes it especially clear that something should happen or be done one more time, while wieder is more neutral and, depending on the context, can also mean a return. Use nochmal when explicitly asking for another repetition.

Der Lehrer erklärt die Regel nochmal, weil viele sie noch nicht verstehen.
The teacher explains the rule again because many students still do not understand it.
Der Lehrer erklärt die Regel wieder, weil viele sie noch nicht verstehen.
The teacher explains the rule again because many students still do not understand it.