Goes back on one's word is an expression used to describe someone who has broken a promise or agreement. This phrase can be broken down into three crossword solutions: ERASES (6 letters), RENEGES (7 letters), and WELCHES (7 letters). ERASES means to remove or delete something, while RENEGES means to go back on a promise or commitment. Finally, WELCHES means to avoid fulfilling an obligation or promise. All three words are used to describe someone who has gone back on their word.