The term 'burden, RESPONSIBILITY' can be summarized by the crossword solution 'ONUS'. ONUS is a Latin word meaning 'burden' or 'RESPONSIBILITY'. It is often used to refer to a duty or obligation that someone has to fulfill. In legal terms, it is used to refer to the burden of proof that one party must provide in order to prove their case. In everyday language, it is used to refer to the RESPONSIBILITY that someone has to take on for a particular task or situation.