To carve, mold, or otherwise create a raised design on a surface so that it stands out from the background.
From en- (causative) + boss, from Old French bosse meaning 'swelling' or 'protuberance.' The word originally meant to create a protruding form on metal or leather.
The word 'boss' in emboss has nothing to do with a supervisor—it comes from the French word for a swelling or bump, which is exactly what happens when you emboss something.
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