Meanings of more hock in English

Badgered into speech, Kergenven drank a little more hock, and dropped out slowly, in the mellowest voice in the world, the following:

The stone-cutter's helper brought another bottle of the heavy, expensive wine, more hock glasses, large Delft plates, and a mountain of sandwiches.

Left alone in the cabin Bolitho drank some more hock, but although his stomach was empty he was unable to face Ozzard's meal.