noun
Refers to the boldness or nerve to face a difficult or frightening situation without flinching. Often used in phrases like 度胸がある (to have guts) or 度胸が据わっている (to be unshakably brave).
彼は大舞台でも度胸が据わっている。
He keeps his nerve even on a big stage.
そんな危ないことをするなんて、ずいぶん度胸があるね。
You've got a lot of nerve doing something so dangerous.
Compound of 度 (degree, measure) and 胸 (chest, heart). The combination suggests the measure of one's heart or spirit, i.e., one's capacity for boldness.