1. the point at which a decisive event happens or you discover if someone/something has been successful
the moment of truth had arrived; would it be a success or failure?
A 'moment of truth' is a time when something is tested to determine its success or a serious decision must be made. The 'moment of truth' can have an impact on the future course of action and may be a turning point for a person or project. In marketing, the 'moment of truth' is the time when a customer first interacts with a brand and forms an opinion of it.