pursed lips breathing

[pûrst]
n.
  1. A technique, used by patients with chronic obstructive pulmonary disease, in which air is inhaled slowly through the nose and mouth and exhaled slowly through pursed lips.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.