where the rubber hits the road

where the rubber hits the road

The point at which someone's or something's efforts, resolve, or viability are put to the test; the point at which things become truly or meaningfully challenging. Their business model is sound, but drumming up continued support with the public throughout the year will be where the rubber hits the road. Her plan sounds good on paper, but how it is implemented on a practical level is where the rubber hits the road.
See also: hit, road, rubber
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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