incumbent on

Related to incumbent on: incumbent upon

incumbent (up)on (someone)

Imposed or expected as an obligation, duty, or requirement on someone. As the wealthier citizens of the country, it's my firm belief that it is incumbent upon us to contribute toward the welfare of those who are less fortunate. He felt it was incumbent on him to take over the responsibilities of his father's business.
See also: incumbent
Farlex Dictionary of Idioms.

incumbent on

Also, incumbent upon. Imposed as an obligation or duty on, obligatory for. For example, He felt it was incumbent on us all to help the homeless. [Mid-1500s]
See also: incumbent, on
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • incumbent
  • incumbent (up)on (someone)
  • incumbent (up)on (someone) to (do something)
  • incumbent to do
  • beholden to (someone)
  • have (got) to (do something)
  • have to
  • burden of proof
  • burden of proof, the
  • announce for