The phrase "deep sixed" typically means to discard, get rid of, or eliminate something completely. Antonyms of this phrase include words like retrieve, restore, revive, and salvage. If something is deep-sixed, it is essentially gone forever, beyond any hope of being brought back or recovered. However, using antonyms like retrieve or restore implies the opposite, indicating that something can be found or rediscovered. Meanwhile, using revive or salvage suggests that there is still potential value to be found in something that might otherwise have been discarded or forgotten. Choosing the right antonym ultimately depends on the context of the situation and the speaker's intended meaning.