The term 'coarse cough' can be summarized by the crossword solution 'CROUP, ' which is a type of respiratory infection caused by a virus. It is characterized by a harsh, barking cough and can be accompanied by a fever, hoarseness, and difficulty breathing. CROUP is most common in children under the age of five and is usually mild and self-limiting. Treatment typically involves supportive care such as humidified air and fluids.