A 'surprise hit' is a term used to describe a movie, song, or other form of entertainment that unexpectedly becomes popular. In this context, the crossword solutions for the term 'surprise hit' are 'SLEEPER' (7 letters), 'SENSATION' (9 letters), and 'BUNT' (4 letters). A 'SLEEPER' is a film or other work of art that was not expected to be successful but eventually became popular. A 'SENSATION' is an event or thing that causes a lot of excitement or interest. Finally, a 'BUNT' is a baseball term used to describe a type of hit in which the batter taps the ball lightly instead of swinging the bat.