"Give it the deep six" is an expression that means to get rid of something or someone, usually with finality. There are various synonyms for this phrase, but some common ones include "bury," "discard," "eliminate," "terminate," "abolish," "annihilate," "extinguish," "obliterate," "quash," "suppress," and "wipe out." Each of these synonyms implies a different level of finality or forcefulness, but all essentially convey the same idea of getting rid of something completely and permanently. So, whether you prefer to bury, discard, eliminate, or extinguish something, there are plenty of ways to express the sentiment of "giving it the deep six".