mulder
v. C2 Proficiency US //ˈməɫdɝ// mul·der
v. to let something rot or go bad, especially when talking about food or plants. It is a very old word that people rarely use today.
v. to decay, rot, or become mouldy. Intransitive; primarily found in archaic or dialectal British English contexts.
The fruit began to mulder in the damp cellar.
Left untouched in the abandoned pantry, the bread started to mulder and turn a dark green.
The ancient tapestries were left to mulder in the humid castle chambers, eventually crumbling into unrecognizable threads of silk and wool.
Usage
The verb is intransitive and does not take a direct object.