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idg. orbho „verwaist; Waise” >- dt. arm(klein) >dt. barmherzig, dt. erbarmen ;
- dt. Roboter,
- dt. Erbe-1 >dt. arbeiten ;
Disclaimer:
The arrow ">" does not always mean an etymological derivation.
Sometimes it may be just a conjecture (even a refuted one), or an error.
Take the tree as a suggestion for lookup, e.g. try https://www.dwds.de/wb/arbeiten#etymwb-1Similar words
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