Incumbent on someone(phrases)
Morally binding or necessary.
Hindi meaning:लाजिमी, अनिवार्य
Synonyms: Obligatory, Necessary, Compulsory, Required, Essential
Antonyms: Optional, Non-Compulsory, Discretionary
Example: It is incumbent on us all to help the needy.
Trick to remember: Income Incumbent on someone hai office me. 
