Horse play is a term used to describe roughhousing or playing around with horses. The term can also be used to describe any type of playful behavior between people. Crossword solutions for the term horse play include POLO (4 letters), EQUUS (5 letters), BBALL (5 letters), and OATER (5 letters). POLO is a sport played on horseback, EQUUS is the scientific name for the horse, BBALL is an abbreviation for basketball, and OATER is a slang term for a western movie featuring horses.