Deep-sixed is an idiom that can be used to mean "thrown away" or "getting rid of something permanently". Some antonyms for this phrase could include "keeping", "retaining", or "preserving". These words suggest that the item in question is not being thrown away or discarded, but instead being kept or protected. Another antonym could be "revived", which indicates that the item was previously tossed aside but has now been brought back to life or put back into use. Other antonyms could include "saved", "salvaged", or "rescued". Regardless of the antonym used, all convey the opposite meaning of throwing something away permanently.