The Collaborative International Dictionary of English v.0.48:

Tas \Tas\, n. [F.]
   A heap. [Obs.] "The tas of bodies slain." --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tas \Tas\, v. t.
   To tassel. [Obs.] "A purse of leather tassed with silk."
   --Chaucer.
   [1913 Webster]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TAS
       Tag Abuse Syndrome (SGML, HTML, slang)