the moment of truth
US /ðə ˈmoʊmənt əv truθ/
UK /ðə ˈmoʊmənt əv truθ/
1.
a time when a person or thing is tested, or when a decision has to be made
:
•
After months of preparation, the moment of truth arrived for the young athlete.
•
The presentation tomorrow will be the moment of truth for our new product.