Be Incumbent on Someone(idiom)
Necessary as a duty or responsibility for (someone).
Hindi meaning:कर्तव्य/ जिम्मेदारी के रूप में जरूरी
Synonyms: Obligatory, Required, Expected, Requisite, Mandatory, Binding
Antonyms: Discretionary, Optional, Voluntary, Non Obligatory
Example: He felt it was incumbent on him to take one the responsibilities of his father’s business.
Trick to remember: In hai to be incumbent on someone hai. 
