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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.
Chemistry. to subject to the process of cracking, as in the distillation of petroleum. Informal. to open and drink (a bottle of wine, liquor, beer, etc.). a break without complete separation of parts; fissure. a slight opening, as between boards in a floor or wall, or between a door and its doorpost.