Webster's English Dictionary

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cough

1. cough \'ko.f\ vb [ME coughen, fr. (assumed) OE cohhian; akin to MHG 
   ku-chen] to breathe heavily 1: to expel air from the lungs suddenly with an 
   explosive noise  2: to make a noise like that of coughing  : to expel by 
   coughing {~ up mucus} 
2. cough n 1: a condition marked by repeated or frequent coughing  2: an 
   act or sound of coughing