The term FOOLS AROUND can be broken down into two crossword solutions: HORSES (6 letters) and KILLSTIME (9 letters). HORSES is a term used to describe four-legged animals that are often ridden for recreation or transportation. KILLSTIME is an idiom that means to do something to pass the time, usually in a frivolous manner. Therefore, FOOLS AROUND can be interpreted as engaging in activities that are not productive or meaningful, but simply done to pass the time.