This is the 6967th most frequent Japanese word.
マッハ
"マッハ" means "Mach," referring to the speed of sound or a high-speed measurement.
This sentence uses マッハ as a measurement of aircraft speed relative to the speed of sound.
飛行機はマッハで飛ぶ。
Airplanes fly at Mach speeds.
Here, マッハ is used metaphorically to signify incredible speed of action.
彼が仕事を終える速さはマッハ級だ。
His speed at completing work is Mach-level.
In this sentence, マッハ conveys an intense or thrilling speed experience.