engrain

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engrain, ingrain.
A. †dye with cochineal XIV;

B. work into the texture or structure of XVII. In sense A — OF. engrainer dye, f. phr. en graine (whence Eng. in GRAIN); in sense B f. EN-1 + GRAIN. Now mainly in pp. (chiefly ingrained) in senses (i) thoroughgoing, incorrigible, (ii) deep-rooted, inveterate.