1. 驳倒;证明…站不住脚
To invalidate something such as an argument, conclusion, or result means to prove that it is wrong or cause it to be wrong.

2. 使无效;使作废
If something invalidates something such as a law, contract, or election, it causes it to be considered illegal.

1. take away the legal force of or render ineffective

e.g. invalidate a contract

Synonym: voidvitiate

2. show to be invalid

Synonym: nullify

3. make invalid for use

e.g. cancel cheques or tickets

Synonym: cancel

4. declare invalid

e.g. The contract was annulled
void a plea

Synonym: annulquashvoidavoidnullify