a bounden duty
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Related to a bounden duty: abandon
old-fashioned Some duty or task one feels obligated to perform or undertake. She considered it her bounden duty to expose the corruption in her company. The president said in his address that the country has a bounden duty to help other nations in need.
a bounden dutya responsibility regarded by yourself or others as obligatory.
Bounden as the past participle of bind is now archaic in all contexts and is seldom found except in this phrase.