Grounding is connecting a generated answer to sources that can be checked, and in the strict sense constraining the answer to evidence that was actually retrieved so each statement can be traced back to a source.

This is one entry in The Knowledge Company claim register: a statement the company publishes, the source it was checked against, the date of the last check and the date that check expires. When the stale-after date passes, the status degrades on its own until a person re-verifies the claim. Nothing is marked verified automatically.