The definition of cough is to force air loudly, without warning through the opening between the vocal cords.(verb)
An example of to cough is clearing a tickle in your throat.
See cough in Webster's New World College Dictionary
Origin: ME coughen, akin to MDu cuchen, to cough, Ger keuchen, to gasp
See cough in American Heritage Dictionary 4
verb coughed, cough·ing, coughs verb, intransitive
Origin: Middle English coughen
Origin: , ultimately of imitative origin.
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