A pop fly is a type of batted ball in baseball. It is a high, soft fly ball that is hit in the air and usually caught by an infielder or outfielder. The term 'pop fly' is also used to describe the same type of batted ball in softball. The crossword solution for the term 'pop fly' is 'BLOOP, ' which is a slang term for a pop fly that is hit softly and falls in between the infielders and outfielders.