step into the breach

基本解釋

This leaves central banks having to step into the breach, as they did last December when interbank rates exploded.
這使得央行不得充當(dāng)“補(bǔ)位”的角色，這正如去年12月銀行拆現(xiàn)問題爆發(fā)時(shí)一樣。
And even if China is shifting out of US Treasuries, it would not necessarily cause trouble in the market as long as other buyers step into the breach.
況且，就算中國對美國國債避而遠(yuǎn)之，只要其它買家能夠補(bǔ)上缺口，就未必會(huì)給市場造成麻煩。
The government’s hope has been that private firms will step into the breach as the public sector sheds jobs because of the harsh spending cuts it has announced.
這是由于政府大量減少支出，削減工作崗位數(shù)量所致。政府希望私營企業(yè)能夠填補(bǔ)這個(gè)缺口。

Yemen's student-led opposition says it is ready to step into the breach when Mr Saleh goes.
ECONOMIST: But who will replace the president?
If the Justice Department is compromised (and the Clinton one is), Congress should step into the breach.
FORBES: Fact and Comment
As the Administration appears incapable of resisting Pyongyang's stratagems, it behooves the Congress step into the breach.
CENTERFORSECURITYPOLICY: Center For Security Policy

If you step into the breach, you do someone else's work when they are unable to do it.