One of the mysteries of the English language finally explained.
A drink to be consumed to the last drop; a wine of the highest quality. Frequently (and in earliest use) figurative: anything excellent of its kind. Now rare.
Late 16th century (in an earlier sense). Apparently humorously from classical Latin super + nagulum, naculum, Latinized form of German Nagel, after German auf den Nagel on to the nail.
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