1
courage;bravery;pluck;nerve;grit;guts
あいつの度胸を試してみよう。
I'll put his courage to the test.
1
to muster one's courage;to resolve oneself;to ready oneself for what is to come
See also:
覚悟を決める (かくごをきめる)
彼は度胸を据えて外人に話し掛けた。
He mustered up his courage to talk to a foreigner.