"Irrevocable damage" means that harm or destruction has occurred in such a way that it cannot be undone or reversed.
Full definition
Such repeated wear and tear from daily activities will
cause irrevocable damage much more quickly than in the thoracic spine.
The plan, first referenced in 1959, made clear it had to be destroyed by a nuclear bomb because the architecture of the tunnel would prevent a less catastrophic explosion from
causing irrevocable damage.
One billion Indians, not to mention another billion Chinese, embracing Western modes of work and consumption will cause
irrevocable damage to the global environment, which is strained enough at having to provide resources for the lifestyles of a few hundred million Americans and Europeans.