Meaning of the word "step into the breach" in English

What does "step into the breach" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

step into the breach

US /stɛp ˈɪntu ðə briːtʃ/
UK /stɛp ˈɪntu ðə briːtʃ/
"step into the breach" picture

Idiom

1.

to take action when another person or group is unable to, or to fill a gap in a difficult situation

Example:
When the lead actor fell ill, his understudy had to step into the breach.
The volunteers had to step into the breach when the regular staff went on strike.
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