step into the breach

US /stɛp ˈɪntu ðə briːtʃ/
UK /stɛp ˈɪntu ðə briːtʃ/
"step into the breach" picture
1.

يحل محل, يسد الفراغ, يتدخل

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

:
When the lead actor fell ill, his understudy had to step into the breach.
عندما مرض الممثل الرئيسي، كان على بديله أن يحل محله.
The volunteers had to step into the breach when the regular staff went on strike.
اضطر المتطوعون إلى سد الفراغ عندما أضرب الموظفون الدائمون.