begem comes from the intensive prefix be- + gem. Gem comes from Old French gemme, from Latin gemma ('bud, precious stone'). Morphologically, the word is transparent as a compound: its parts remain visible in the modern spelling, while the older history of those parts supplies the deeper ancestry. In modern use, the verb sense is "to adorn with or as if with gems (literary)", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as gem and derivatives such as begemmed, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Old English be-, Latin gemma, which anchor the explanation in named linguistic material.