square breathing
n.— «Physical tactics during public speaking are also important in reducing nervousness and succeeding during a public presentation. Loving suggests a technique called square breathing: Breathe in through your nose, pushing your stomach out while counting to four. Hold the breath to the count of four. Breathe out through your mouth, sucking in your stomach to the count of four, then hold to the count of four.» —“Some tips to boost public speaking skills” Star-Gazette (Elmira/Corning, New York) Jan. 2, 2008. (source: Double-Tongued Dictionary)
Further reading
Stunt performers in movies have their own jargon for talking about their dangerous work. In New York City, the slang term brick means “cold,” and dumb brick means “really cold.” Plus: the East and Central African tradition...