noun

• (anatomy) The malleus, a small bone of the middle ear.
• (music) In a piano or dulcimer, a piece of wood covered in felt that strikes the string.
  "The sound the piano makes comes from the hammers striking the strings"
• (sports) A device made of a heavy steel ball attached to a length of wire, and used for throwing.
• (curling) The last stone in an end.

verb

• (figuratively) To emphasize a point repeatedly.
• (sports, etc.) To hit particularly hard.
  "This time the defender was teed up by Andrew Johnson's short free-kick on the edge of the box and Baird hammered his low drive beyond Begovic's outstretched left arm and into the bottom corner, doubling his goal tally for the season and stunning the home crowd."
• (cycling, intransitive, slang) To ride very fast.
  "Fifteen minutes later, leaving a vapour trail of kitchen smells, I hammered into Obterre."
• (intransitive) To strike internally, as if hit by a hammer.
  "I could hear the engine’s valves hammering once the timing rod was thrown."

noun

• (soccer) someone connected with West Ham Football Club, as a fan, player, coach etc.