To mark or label with a tag or tags.
From prefix 'be-' + 'tag' (from Middle Dutch 'tagge'). The 'be-' adds the sense of thoroughly or completely tagging something.
In the age of RFID and barcoding, 'betag' is an archaic word that describes exactly what modern systems do — they 'betag' products to track inventory, label sheep to identify ownership, and tag documents for organization.
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