Deep sixing means to get rid of or abolish something completely, especially by burying it. The antonyms for the word deep sixing would be preserving, retaining, saving or upholding. When you preserve something, you protect it from harm and decay, ensuring that it stays in good condition for a long time. Similarly, when you retain something, you hold onto it and prevent it from being lost or destroyed. When you save something, you act to prevent harm from coming to it. And when you uphold something, you support and defend it, ensuring that it continues to exist and remains valued. In contrast to deep sixing, these antonyms seek to protect, maintain and promote what is valuable and important.