Answer: KEEPTHECHANGE

"Keepthechange" can mean a few different things, so it's important to clarify the context. However, based on the clue "Tip line?", it can refer to a practice commonly found in some establishments, such as cafes or restaurants, where the total amount charged to a customer is rounded up to the nearest dollar or a set amount. The additional money, often referred to as the "change," is collected as a tip. This practice is sometimes labeled as "keepthechange." It's pertinent to note that "keepthechange" can also be used in digital payment apps or services, where users have the option to automatically round up their transactions to the nearest dollar and save or invest the extra change.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Tip line?. Explanations are generated by AI and may be inaccurate.