Moral obligation is a concept that refers to an ethical responsibility or DUTY that one has to uphold. It is often seen as a binding force that requires individuals to act in accordance with certain standards of behavior. The term can be broken down into three parts: DUTY (4 letters), OUGHT (5 letters), and TIE (3 letters). DUTY is an action or task that is required of someone, OUGHT is a verb meaning to be obligated to do something, and TIE is a connection or bond between two people or things. Together, these three words form the concept of moral obligation, which is an ethical responsibility that one must fulfill.