To stamp, imprint, or mark with a stamp or impression; to mark or impress deeply.
From 'stamp' plus 'en-' prefix. 'Stamp' comes from Old Norse 'stampa' (to stamp/tread), related to Old English 'stempan.' The 'en-' makes it mean 'to mark by stamping.'
Medieval printers used 'enstamped' to describe paper that had been pressed with a watermark or seal—the prefix 'en-' transforms 'stamp' (the object) into the action of permanently marking something with the stamp's impression.
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