The term 'weasel out (on)' can be summarized by the crossword solution 'RENEGE' which is a six-letter word. To 'RENEGE' means to go back on a promise or commitment, or to fail to fulfill an obligation. It is derived from the Latin word 'renegere' which means to deny or reject. This term is often used in a negative context, as it implies that someone has gone back on their word or failed to keep a promise.