1. an act of breaking or failing to observe a law, agreement, or code of conduct
2. a gap in a wall, barrier, or defense, especially one made by an attacking army
3. a breakdown of relations; a quarrel

1. to make a gap in and break through (a wall, barrier, or defense)
2. to break or fail to observe (a law, agreement, or code of conduct)

Examples

• The company was sued for breach of contract.
• Enemy forces found a breach in the castle wall.
• The scandal caused a serious breach between the two friends.
• The protesters tried to breach the security barrier.
• He was fired for breaching company policy.
• The dam was breached during the flood.
• There was a breach of trust between the partners.
• The whale breached the surface of the water.