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verb. A crack in the ground. A crack in the ground. The definition of crack is a sudden, sharp breaking sound or a break in something. 1  An example of crack is the sound of a bone breaking.
Medical Definition of break. 1  1a: an act or action of breaking : fractureb: the act of opening a gap in an electrical circuit. 2  2a: a condition produced by breaking the break in her legb: a gap in an otherwise continuous electric circuit.