Source : Webster's Revised Unabridged Dictionary (1913)

Sark \Sark\, n. [AS. serce, syrce, a shirt; akin to Icel. serkr,
   Sw. s["a]rk.]
   A shirt. [Scot.]

Sark \Sark\, v. t. (Carp.)
   To cover with sarking, or thin boards.