Possible Results:
Imperfect yo conjugation of arbitrar.
Imperfect él/ella/usted conjugation of arbitrar.

arbitrar

Yno hubo ningún jefe que arbitraba las disputas constantes.
And there was no chairman to referee the constant disputes.
El Gobierno de Hong Kong no arbitraba controversias ni tenía ningún reglamento provisional.
The Hong Kong Government did not arbitrate disputes nor did it have any provisional rules of procedure.
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Christmas carol