General antonyms:
* Liberate
* Empower
* Free
* Uphold
* Protect
* Support
* Encourage
* Enhance
* Elevate
Antonyms related to specific types of oppression:
* Equalize (for oppression based on inequality)
* Tolerate (for oppression based on intolerance)
* Respect (for oppression based on disrespect)
* Include (for oppression based on exclusion)
* Validate (for oppression based on invalidation)
Antonyms for specific contexts:
* Nurture (if the oppression is causing harm or preventing growth)
* Advocate (if the oppression is preventing someone from having a voice)
* Celebrate (if the oppression is preventing joy or expression)
The best antonym will depend on the specific context and the type of oppression being discussed.