ETYM Cg. Dutch kuch. Related to Cough.
1. Sudden expulsion of air from the lungs that clears the air passages; a common symptom of upper respiratory infection or bronchitis or pneumonia or tuberculosis; SYN. coughing.
2. The act of exhaling air suddenly with a noise; SYN. coughing.

To exhale abruptly, as when one has a chest cold or congestion.