Broke through or made a gap in something (like a wall or security system), or violated a rule or agreement.
From Old French 'breche,' from Germanic roots related to 'break.' A breach is literally a break or gap, especially one made in a fortification during warfare.
Medieval soldiers studied 'breaches' in castle walls so carefully that the angle and size of a breach could tell you what size cannon was used to make it—the word became both literal and strategic.
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