The term 'The BUCK Stops Here' is a phrase that was popularized by President Harry S. Truman. It means that the person in charge of a situation is ultimately responsible for the outcome, and cannot pass the blame onto someone else. The phrase is a reminder that leaders must take responsibility for their decisions. The crossword solution for this phrase is 'BUCK, ' which is a reference to the BUCK stops here sign that President Truman had on his desk.