The Collaborative International Dictionary of English v.0.48:

borscht \borscht\ n. [Yiddish borscht, fr. Russian]
   a Russian soup usually containing beet juice as a foundation,
   and often served with sour cream. Also, as used in the U.S.,
   a sour cabbage soup, called in Russian shchi.

   Syn: borsch, borsh, borsht, borshch, bortsch.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

borscht
    n 1: a Russian or Polish soup usually containing beet juice as a
         foundation [syn: borsch, borsh, borscht, borsht,
         borshch, bortsch]

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

BORSCHT
       Battery, Overvoltage, Ringing, Signalling, Coding, Hybrid,
Testing [functions] (PBX)