The phrase "you can count on me" means that someone is reliable and dependable; the person saying it is assuring that others can trust them or rely on them to be there or to follow through on something. In the context of the New York Times Mini Crossword puzzle on September 18, 2025, the answer to the clue "You can count on me" is "IWILL," which is a concise way of expressing a promise or commitment to dependability.