Definitions

1. verb

to fall off or become detached, especially the leaves of a plant.

“The trees began to defail their autumn leaves.”

2. verb

to fail or come to an end, especially a project or a plan.

“The company’s new project started to defail due to lack of funding.”

3. verb

to become weak or imperfect, especially a material or a structure.

“The bridge started to defail after years of neglect.”