To crumble into small particles; to turn to dust by natural decay; to lose form, or waste away, by a gradual separation of the component particles, without the presence of water; to crumble away.
The chaplain was the only officer attached to Group Headquarters who did not reside in the moldering red stone Group Headquarters building itself or in any of the smaller satellite structures that rose about the grounds in disjuncted relationship.
Joseph Heller. Catch-22, p.200 (1961)
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half the windows were closed with gray worm-eaten shutters about which the jasmine-boughs grew in wild luxuriance; the mouldering garden wall with hollyhocks peeping over it was a perfect study of highly mingled subdued color, and there was an aged goat (kept doubtless on interesting superstitious grounds) lying against the open back-kitchen door.
George Eliot. Middlemarch
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and their bones would have mouldered in the rotting hull of the African Queen among the mangroves.
Cecil Scott Forester. The African Queen, p.132 (1935)