1breach 
/ˈbri:tʃ/ noun
plural breach·es /ˈbri:tʃ/ noun 1 : a failure to do what is required by a law an agreement or a duty : failure to act in a required or promised way — usually + of [count] ▪ This is clearly a breach of the treaty. ▪ He was fined for committing a breach of the peace. [=for making a lot of noise or behaving violently in public; for disorderly conduct] ▪ Many people consider her decision to be a breach of trust/confidence. [noncount] ▪ They sued him for breach of contract. [=for failing to do what the contract required] ▪ The judge ruled that the doctor's actions were in breach of her contractual duty. 2 ◊A breach of security or a security breach is an occurrence in which someone is able to get into a place that is guarded or is able to get secret information.
▪ The break-in was a serious breach of security. ▪ Allowing such information to be released to the public is considered a security breach. 3 [count] : a break in friendly relations between people or groups — often + between ▪ The breach between them developed years ago. ▪ The misunderstanding had caused a breach between the families. ▪ The decision caused a breach between the two countries. 4 [count] : a hole or opening in something (such as a wall) made by breaking through it
▪ They repaired a breach in the fence.
▪ The break-in was a serious breach of security. ▪ Allowing such information to be released to the public is considered a security breach.
▪ They repaired a breach in the fence.
into the breach
◊If you step/leap/jump (etc.) into the breach, you provide help that is badly needed, such as by doing a job when there is no one else available to do it.
▪ He stepped into the breach when the company needed new leadership.
▪ He stepped into the breach when the company needed new leadership.
