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

1.
mengambil alih, mengisi kekosongan
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.
Ketika aktor utama sakit, pemeran penggantinya harus mengambil alih.
•
The volunteers had to step into the breach when the regular staff went on strike.
Para sukarelawan harus mengisi kekosongan ketika staf reguler mogok.