the world > plants > by growth or development > defined by poor growth > wither [verb (intransitive)] > root-fall or damp off (3)
intransitive. to fog off: (of a seedling) to perish or rot through being attacked by any of several fungi or fungus-like microorganisms which…
intransitive. To become root-fallen. Cf. root-fall, n. 2.
Horticulture. to damp off (intr.): Of plants: To rot or go off from damp; to fog off.