From Longman Dictionary of Contemporary Englishthe damage is donethe damage is doneTIME4#used to say that something bad has happened which makes it impossible to go back to the way things were before it happened She immediately apologized, but the damage was done. → damage
Examples from the Corpus
the damage is done• The concert is still reverberating in our ears and the damage is done.• The symptoms are often obvious, identifiable, and even treatable before the damage is done.• Crew scurries to cover the lanes and approaches, but the damage is done.• Ed apologized a week later, but the damage was already done.• For the most part, the damage is done by soluble aluminium released from soil by acid water.• It is when guilt lingers into adulthood that the damage is done.• Well, the damage is done now. 