copus — English Dictionary

Noun

1. A mug.

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   PORSON, Whose very name conjures up the spirits of ten thousand wits, holding both sides, over a copus of Trinity ale and a classical pun, would not only frequently “steal a few hours from the night,” but see out both lights and liquids, and seem none the worse for the carouse.

2. A drink of ale mixed with spices, and varied by spirits, wines, etc.

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   We beg you would not stand fiddling about it, but be married forthwith, and then take chaise, and come […] all the way to Cambridge […] for our copuses and Welsh rabbits are impatient for you.