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incumbent (adj) obligatory; duty bound.
It is incumbent on a person to do something if they have to do it as a part of their duty. For example, it is incumbent on a mayor to attend to the civic needs of the people of his city, as it is for that that they are elected mayor. It is incumbent on the president of a country to safeguard the interests of his country.
- It is incumbent on a doctor to use his knowledge of medicine to save a patient that comes to them; after all, a doctor takes oath to serve the sick and the dying.
- It is incumbent on police officials to maintain law and order and check crime. That is a part if their duty.