(1):

(v. t.) To expel from the lungs or air passages by coughing; - followed by up; as, to cough up phlegm.

(2):

(v. t.) To bring to a specified state by coughing; as, he coughed himself hoarse.

(3):

(v. i.) A sudden, noisy, and violent expulsion of air from the chest, caused by irritation in the air passages, or by the reflex action of nervous or gastric disorder, etc.

(4):

(v. i.) To expel air, or obstructing or irritating matter, from the lungs or air passages, in a noisy and violent manner.

(5):

(v. i.) The more or less frequent repetition of coughing, constituting a symptom of disease.