The term 'let slide' can be defined by four crossword solutions: DROP (4 letters), IGNORE (6 letters), NEGLECTED (9 letters), and NEGLECT (7 letters). To 'DROP' something is to release it from one's grasp, while to 'IGNORE' something is to pay no attention to it. To be 'NEGLECTED' is to be disregarded or abandoned, and to 'NEGLECT' something is to fail to take proper care of it. In summary, the term 'let slide' implies that something is not given the attention it deserves and is allowed to pass without consequence.