The Collaborative International Dictionary
To cough down
Cough \Cough\, v. t.
To expel from the lungs or air passages by coughing; -- followed by up; as, to cough up phlegm.
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To bring to a specified state by coughing; as, he coughed himself hoarse.
To cough down, to silence or put down (an objectionable speaker) by simulated coughing.