The phrase "鲤鱼打挺" is formed by directly combining the noun "鲤鱼" (carp) with the verb phrase "打挺" (to kick up or arch suddenly), creating a literal image of a carp leaping vigorously from water. This compound then serves as a metaphorical term for a specific physical maneuver where a person quickly rises from a supine position by arching the back and thrusting the legs, drawing a direct analogy to the fish's action.