moment of truth

Noun

idiomatic

(idiomatic) A deciding instant; the time when a test determines or makes it apparent whether something will succeed.

Japanese Meaning

決定的瞬間（物事の成否を左右する決定的な時刻） / 真実の瞬間（本質や実力が試され、結果が明らかになる大事な瞬間）

When she stepped onto the stage, it was her moment of truth.

彼女が舞台に一歩足を踏み出したとき、それは彼女の正念場だった。

Sense（1）

(idiomatic) A deciding instant; the time when a test determines or makes it apparent whether something will succeed.

The moment of truth comes when you try to start the engine you have just rebuilt.

moments of truth

（ plural ）