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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.
1. a crack, break, or rupture. 2. a breaking, infringement, or violation of a promise, obligation, etc. 3. any severance or separation: there was a breach between the two factions of the party. 4. (Military) a gap in an enemy's fortifications or line of defence created by bombardment or attack. 5. (Zoology) the act of a whale in breaking clear of the water.