From Longman Dictionary of Contemporary Englishfall into ruinfall into ruin (also go to ruin)DESTROY if something falls into ruin, it gets damaged or destroyed because no one is taking care of it He had let the farm go to ruin. → ruin
Examples from the Corpus
fall into ruin• In 1685 the castle was burnt by the Duke of Argyll and fell into ruin.• The 18th century mansion has fallen into ruin.• Unemployment runs at more than 50 %, and most factories have fallen into ruin.• Miles of poverty with modern adobe dwellings either being built or falling into ruin. 