A drinking vessel or cup that is completely full, filled to the very edge or brim.
From 'brim' (Old English origin, meaning 'edge' or 'rim') plus the agent suffix '-er,' creating something that is 'brimmed.' Used since at least the 1600s.
In Shakespeare's time, a 'brimmer' of ale was a symbol of generosity and celebration—the fuller the cup, the more welcome the guest, which is why it appears in drinking songs!
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