The crossword solution for the term WASH is SEN. SEN stands for Senate, which is a legislative body in many countries, including the United States. The Senate is composed of elected members who represent their state or district and are responsible for making laws and debating important issues. In the United States, the Senate is one of two chambers of Congress, the other being the House of Representatives. A bigwig in the Senate is an influential member who has a lot of power and influence over the legislative process.