VERB
使无效;使作废
If something invalidates something such as a law, contract, or election, it causes it to be considered illegal.
例句
An official decree invalidated the vote in the capital...
一份官方法令宣布在首都举行的投票无效。
A contract signed now might be invalidated at some future date.
现在签订的合同可能在将来的某一天就会失效。