Antonyms for the phrase "makes null void" include terms like validate, confirm, sustain, uphold, and affirm. When an action is validated or confirmed, it is considered a valid and binding action that cannot be negated. Similarly, when something is sustained, upheld, or affirmed, it is supported or maintained as lawful and binding. These antonyms imply that the original action, decision, or agreement has value and is recognized as such. In contrast, making something null and void means that it is effectively cancelled and no longer holds legal or moral weight. It is important to understand both the synonyms and antonyms of a phrase to gain a complete understanding of its meaning.