cough (one's) head off(redirected from cough their heads off)
cough (one's) head off
To cough intensely, as from an illness. Natalie has still been coughing her head off, so I don't think the antibiotic you gave her has helped.
cough one's head off
Fig. to cough long and hard. (See also laugh one's head off.) I had the flu. I nearly coughed my head off for two days.