hacking

(computing) Playful solving of technical work that requires deep understanding, especially of a computer system.

(computing) Unauthorized attempts to bypass the security mechanisms of an information system or network. See also cracker.

(pathology) A dry coughing; the emission of a succession of short coughs.

(sports, chiefly American football, soccer, rugby) A kick in the shins.

(massage) The act of striking the muscles with the side of the hand.

(UK, countable) A riding or journey on horseback.

(obsolete) The operation of working over the faces of rough or worn grindstones with a hack-hammer.

(obsolete, masonry) The separation of a course of stones into two smaller courses, when there are not enough large stones to form a single course.

(obsolete, gem-cutting) The cuts and grooves made in the metal laps by holding the cutting edge of a steel blade against them while in motion, for the purpose of providing receptacles or pockets for the powders using in cutting and polishing gems.

(obsolete, brick-making) The piling of bricks for drying.