v.
   - reduce (a food or other substance) to a pulpy mass by crushing it. 
▸US & W. Indian informal press forcefully on.
 - (in brewing) mix (powdered malt) with hot water to form wort.
 - N. English (with reference to tea) brew or infuse.
 
n.
   - a soft mass made by crushing a substance into a pulp. 
▸Brit. informal boiled and mashed potatoes.
 - bran mixed with hot water, given as a warm food to horses.
 - (in brewing) a mixture of powdered malt and hot water, which is left standing until the sugars dissolve to form the wort.
 
 
  Etymology
  OE māsc (used as a brewing term), of W. Gmc origin.