To grow out excessively; to grow abnormally or beyond normal bounds.
From Latin excrescere (to grow out), from ex- (out) + crescere (to grow); originally meant any outward growth but became associated with abnormal growths.
This verb shares the same root 'cresc' with words like 'crescendo' and 'crescent'—they all mean growth—but 'excrescе' specifically means unwanted, excessive growth, like how a cancer 'grows out' uncontrollably.
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