noun
plural breaches
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]
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.
[count] :a break in friendly relations between people or groups - often + between
[count] :a hole or opening in something (such as a wall) made by breaking through it
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.
verb
breaches; breached; breaching
[+ obj] to fail to do what is required by (something, such as a law or agreement) :to break or violate (something)
to make a hole or opening in (something)