To ruin or destroy something completely; to reduce to ruins or a state of destruction.
From Latin 'deruinare,' composed of 'de-' (down, away) and 'ruinare' (to fall, collapse, ruin), derived from 'ruina' (ruin). The prefix intensifies the meaning of ruin.
The Latin prefix 'de-' was obsessively used in academic writing to intensify words—'deruinate' is a fancy way to say 'ruin thoroughly,' but standard English prefers just 'ruin'!
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