An archaic or obsolete past tense form meaning to grow together or become united into one mass.
From Middle English, related to concresce and concrescere (Latin 'to grow together'). This form represents an older conjugation pattern now replaced by 'concreted' in modern English.
This is a linguistic fossil—'concrew' is how people centuries ago described how separate things fused together, like how minerals crewed together to form stone, showing how our language evolves and even abandons old words.
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