風喘気息
fu zen ki soku
Rev Ito described the zengo indicating how to take a breath during zazen.
Fu: Wind. Describing taking a breath loudly.
Zen: Not smooth breathing.
Ki: Rough breath.
Soku: This word represents perfect breath which is quiet, smooth and not rough.
Rev Ito mentioned that he was taught to breath in for 7 seconds and out for 23 seconds during zazen.