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The Collaborative International Dictionary
Sack posset

Sack \Sack\ (s[a^]k), n. [OE. seck, F. sec dry (cf. Sp. seco, It. secco), from L. siccus dry, harsh; perhaps akin to Gr. 'ischno`s, Skr. sikata sand, Ir. sesc dry, W. hysp. Cf. Desiccate.] A name formerly given to various dry Spanish wines. ``Sherris sack.''
--Shak.

Sack posset, a posset made of sack, and some other ingredients.