A hand tool consisting of a handle with a head of metal or other heavy rigid material that is attached at a right angle, used for striking or pounding. A tool or device similar in function or action to this striking tool, as: The part of a gunlock that hits the primer or firing pin or explodes the percussion cap and causes the gun to fire. Music One of the padded wooden pieces of a piano that strikes the strings. A part of an apparatus that strikes a gong or bell, as in a clock. Anatomy See malleus. Sports A metal ball weighing 16 pounds (7.2 kilograms) and having a long wire or wooden handle by which it is thrown for distance in track-and-field competition. A small mallet used by auctioneers. To hit, especially repeatedly, with or as if with a hammer; pound. See Synonyms at beat. To beat into a shape with or as if with a hammer: hammered out the dents in the fender; hammered out a contract acceptable to both sides. To put together, fasten, or seal, particularly with nails, by hammering. To force upon by constant repetition: hammered the information into the students' heads. To defeat soundly. To inflict a heavy loss or damage on. To deal repeated blows with or as if with a hammer; pummel: "Wind hammered at us violently in gusts\u201d ( Thor Heyerdahl). To undergo beating in the manner of a hammer: My pulse hammered. Informal To keep at something continuously: hammered away at the problem. under the hammer For sale at an auction.