
seinetwegen
because of him
Because of this male person or because of this object; due to him or it.
Seinetwegen mussten wir den ganzen Weg zurückgehen.
Because of him, we had to go all the way back.
because of him / fine by him
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because of him
Because of this male person or because of this object; due to him or it.
Seinetwegen mussten wir den ganzen Weg zurückgehen.
Because of him, we had to go all the way back.

fine by him
Used colloquially to express that the male person in question allows something or does not mind.
Seinetwegen können wir auch später kommen, ihm ist das egal.
It's fine by him if we come later; he doesn't mind.
'Seinetwegen' (because of him / fine by him) is a fixed adverb and often appears at the beginning of the sentence or in the middle field. When it appears at the beginning of a sentence, the finite verb follows directly in the main clause.
Seinetwegen mussten wir den Termin verschieben.
Because of him, we had to reschedule the appointment.
Wir mussten seinetwegen den Termin verschieben.
We had to reschedule the appointment because of him.
In the meaning 'aufgrund seiner Person oder Sache' (because of him or it), 'seinetwegen' often occurs with verbs and expressions such as 'warten' (to wait), 'zurückgehen' (to go back), 'Probleme haben' (to have problems), or 'Schwierigkeiten bekommen' (to run into difficulties).
Wir haben seinetwegen eine Stunde gewartet, weil er den Zug verpasst hatte.
We waited an hour because of him; he had missed the train.
The meaning 'von ihm aus, er hat nichts dagegen' (as far as he's concerned; he has no objection) is colloquial and is used when giving permission or making a concession. 'Seinetwegen' expresses the agreement or indifference of the male person referred to by 'sein' (his).
Papa sagt, seinetwegen dürfen wir den Film noch zu Ende schauen.
Dad says it's fine by him if we finish watching the movie.