General Antonyms:
* Encourage
* Promote
* Foster
* Support
* Uphold
* Permit
* Allow
* Enable
* Liberate
* Emancipate
* Unleash
* Release
Specific Antonyms:
* Reveal (opposite of suppress information)
* Express (opposite of suppressing emotions)
* Stimulate (opposite of suppressing growth or activity)
* Amplify (opposite of suppressing a sound or signal)
The best antonym for "suppress" depends on the specific context in which it is used.