The story
From Thach + weave. Named after WWII U.S. naval aviator John S. Thach, who invented the manoeuvre.
Etymology from Wiktionary, CC BY-SA 4.0.
Thach weave
Today it means: A tactic in aerial combat of the World War II era, where two aircraft on patrol fly a parallel course, and if attacked, overlap their flight paths repeatedly, enabling each to protect the other. Full definition →