Storing film long term and “Latent Image Regression” definition

[Weenie]

Read this brief description of how to store film for the long term but it references “Latent Image Regression”. Bing says it means:

---
Latent image regression: An exposed but undeveloped film slowly loses detail and contrast, especially in the least exposed areas, as the electrons that have been knocked into higher-energy orbits by photons of light drop back into their older, lower-energy orbits. This is a slow process and you need not worry about it for weeks or months, and indeed we have often developed films that were exposed over a year before without seeing any detectable loss of quality.
---

Can anyone translate that into simple words?