"breathing by" is correct and usable in written English in certain contexts.
For example: She stayed alive by breathing by the sheer power of her will.
Control your breathing by timing it, taking maybe twenty breaths a minute.
Check the breathing by watching the mouth and nose for any sign of breath, or by watching the flanks (stomach) rise and fall.
The EPAP delivered by NPPV may help to decrease dynamic hyperinflation by maintaining small airway patency and may reduce the patient's work of breathing by decreasing the drop in alveolar pressure needed to initiate a breath.
TRENTON Mill Hill Playhouse "Instructions for Breathing," by Caridad Svich.
The inhalers, which would help breathing by opening the airways, contain beta-2 agonists, a category of drug banned by the World Anti-Doping Agency.
I particularly like the long-haired gentleman trying to stop the egg-white-haired gentleman breathing by smothering him with his breasts.
Old-school hip-hop – the pre-commercial world of block parties, breakdancing, graffiti – was no longer living and breathing by then.
The artificial heart has helped the man's breathing by clearing the fluid that had accumulated in his lungs before the implant from a condition known as pulmonary edema.
"It has many moods that you can accord yourself with by controlling your breathing, by controlling the way you shift your weight.
That sound you hear is the sound of despair — the hard swallowing and deep breathing by reluctant Republicans crossing their fingers and praying for the best.
Vigorous movements of this kind provide jet propulsion, but gentler ones serve for breathing by circulating water, and thus oxygen, through the mantle and gills.
