cough (one's) head off
(redirected from coughing their head 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.