Etymology
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dry rot (n.)

"fungal decay in timber," by 1779, from dry (adj.) + rot (n.). Figurative sense of "concealed or unsuspected inward degeneration" is by 1821.

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Definitions of dry rot

dry rot (n.)
a crumbling and drying of timber or bulbs or potatoes or fruit caused by a fungus;
dry rot (n.)
a fungus causing dry rot;
From wordnet.princeton.edu