The Collaborative International Dictionary of English v.0.48:

Bosh \Bosh\, n. [Cf. G. posse joke, trifle; It. bozzo a rough
   stone, bozzetto a rough sketch, s-bozzo a rough draught,
   sketch.]
   Figure; outline; show. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bosh \Bosh\, n. [Turk.]
   Empty talk; contemptible nonsense; trash; humbug. [Colloq.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bosh \Bosh\, n.; pl. Boshes. [Cf. G. b["o]schung a slope.]
   [1913 Webster]
   1. One of the sloping sides of the lower part of a blast
      furnace; also, one of the hollow iron or brick sides of
      the bed of a puddling or boiling furnace.
      [1913 Webster]

   2. pl. The lower part of a blast furnace, which slopes
      inward, or the widest space at the top of this part.
      [1913 Webster]

   3. In forging and smelting, a trough in which tools and
      ingots are cooled.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bosh
    n 1: pretentious or silly talk or writing [syn: baloney,
         boloney, bilgewater, bosh, drool, humbug,
         taradiddle, tarradiddle, tommyrot, tosh, twaddle]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "bosh":
   balderdash, balls, baloney, bilge, blague, blah, blah-blah,
   blatherskite, bop, bull, bullshit, bunk, bunkum, claptrap, crap,
   eyewash, flam, flapdoodle, flimflam, gammon, gas, guff, gup,
   hogwash, hoke, hokum, hooey, hot air, humbug, humbuggery,
   jiggery-pokery, malarkey, moonshine, piffle, poppycock, rot,
   rubbish, scat, shit, tommyrot, tripe, wind



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

BOSH
       Bytestreams Over Synchronous HTTP (HTTP)