The crossword solution for the term 'BY POP' is 'REP'. The term 'REP' stands for representative, which is a person who acts on behalf of another person or organization. Representatives are often elected to represent a certain group of people in a legislative body, such as a government or a company. They are also responsible for communicating the needs and interests of their constituents to the larger body. Representatives can also be appointed to represent a certain cause or organization.