The crossword solution for the term 'Imitate a Bronco' is 'BUCK'. This term refers to the act of bucking, which is a type of movement performed by horses, particularly broncos. Bucking is an instinctive reaction to pressure or discomfort, and is often used in rodeo competitions. It involves the horse arching its back and kicking out with its hind legs. Imitating a bronco, then, would involve mimicking this movement.