Definitions of mash:

• noun:   mixture of ground animal feeds
• noun:   a mixture of mashed malt grains and hot water; used in brewing
• verb:   reduce to small pieces or particles by pounding or abrading

  Example: "Mash the garlic"

• verb:   to compress with violence, out of natural shape or condition
• verb:   talk or behave amorously, without serious intentions
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #12003)