The term 'DROPS IN ON' is a phrase used to describe an unexpected visit. It is composed of two words, 'DROPS IN' and 'ON', which can be found IN the solutions to the crossword puzzle. The first word, 'VISITS', is a six-letter word meaning to go to a place for a short period of time. The second word, 'SEES', is a four-letter word meaning to look at or observe something. Together, these two words form the phrase 'DROPS IN ON', which describes an unexpected visit.