* To discredit or make something untrue: The new evidence completely invalidated the original theory.
* To make something no longer valid or effective: The expired license invalidated her driving privileges.
* To make something worthless or meaningless: His harsh words invalidated all of her hard work.
* To show that something is wrong or false: The results of the test invalidated the previous findings.
* To cancel or nullify something: The judge's ruling invalidated the contract.
Let me know if you'd like more examples or need help with a specific sentence!