Source : Webster's Revised Unabridged Dictionary (1913)

Mash \Mash\, v. t. [imp. & p. p. {Mashed}; p. pr. & vb. n.
   {Mashing}.] [Akin to G. meischen, maischen, to mash, mix, and
   prob. to mischen, E. mix. See 2d {Mash}.]
   To convert into a mash; to reduce to a soft pulpy state by
   beating or pressure; to bruise; to crush; as, to mash apples
   in a mill, or potatoes with a pestle. Specifically (Brewing),
   to convert, as malt, or malt and meal, into the mash which
   makes wort.

   {Mashing tub}, a tub for making the mash in breweries and
      distilleries; -- called also {mash tun}, and {mash vat}.

Mash \Mash\, n.
   A mesh. [Obs.]

Mash \Mash\, n. [Akin to G. meisch, maisch, meische, maische,
   mash, wash, and prob. to AS. miscian to mix. See {Mix}.]
   1. A mass of mixed ingredients reduced to a soft pulpy state
      by beating or pressure; a mass of anything in a soft pulpy
      state. Specifically (Brewing), ground or bruised malt, or
      meal of rye, wheat, corn, or other grain (or a mixture of
      malt and meal) steeped and stirred in hot water for making
      the wort.

   2. A mixture of meal or bran and water fed to animals.

   3. A mess; trouble. [Obs.] --Beau. & Fl.

   {Mash tun}, a large tub used in making mash and wort.

Source : WordNet®

mash
     v 1: to compress with violence, out of natural shape or
          condition; "crush an aluminum can"; "squeeze a lemon"
          [syn: {squash}, {crush}, {squelch}, {squeeze}]
     2: talk or behave amorously, without serious intentions; "The
        guys always try to chat up the new secretaries"; "My
        husband never flirts with other women" [syn: {chat up}, {flirt},
         {dally}, {butterfly}, {coquet}, {coquette}, {romance}, {philander}]
     3: reduce to small pieces or particles by pounding or abrading;
        "grind the spices in a mortar"; "mash the garlic" [syn: {grind},
         {crunch}, {bray}, {comminute}]

mash
     n 1: a mixture of mashed malt grains and hot water; used in
          brewing
     2: mixture of ground animal feeds