Dictionary definition · breach
noun
- a failure to perform some promised act or obligation
- an opening (especially a gap in a dike or fortification)
- a personal or social separation (as between opposing factions)"they hoped to avoid a break in relations"
verb
- act in disregard of laws, rules, contracts, or promises"offend all laws of humanity"
- make an opening or gap in
Source: Open English WordNet (CC BY 4.0).