clear, fundamental, grave, serious
deliberate, flagrant
He refused to shake hands, in deliberate breach of etiquette.

minor
security
alleged (esp. BrE)
gross, major

constitute
Such actions constitute a breach of confidentiality.

commit
remedy
prevent

in breach of
The court's decision is in breach of the Convention.

breach of
a minor breach of discipline

a breach of confidence, a breach of trust
(a) breach of confidentiality, breach of contract
He was sued for breach of contract.

a breach of security
a breach of the peace

cause, lead to
heal, repair

breach between
What caused the breach between the two brothers?

breach with
She left home following the breach with her family.