The phrase "to drop off" means to leave something or someone at a particular place. It can be used in various contexts such as leaving an item, person, or package at a location for pickup, delivering goods, or simply departing from somewhere. For example, one might say "I will drop off the kids at school," meaning they are taking them to school and then leaving. Another use could be "Please drop off your dry cleaning on your way home." This means that someone is asking you to leave their dry cleaning at a specific location on your way back from work.