What is Cough ?
Cough is (noun) the act of sending the air out of your lungs suddenly, e.g. when you are ill Take some cough medicine if your cough is bad. He ought to see the doctor if his cough is no better. He gave a little cough to attract the waitress’s attention.(verb) to send air out of your lungs suddenly because your throat hurts The smoke from the fire made everyone cough. People with flu go around coughing and sneezing.
source: Easier English, Student Dictionary Upper Intermediate Level