The phrase "see the last of someone/something" means to have the final encounter with someone or something, suggesting that it will not be seen again. Synonyms for this phrase include "bid farewell to," "say goodbye to," "part ways with," "leave behind," and "farewell." Other expressions with similar meanings include "close the final chapter," "end the final chapter," "see the back of," and "put something to bed." Essentially, all of these expressions convey the idea that a final goodbye or ending has occurred, implying that there will be no further contact or interaction in the future.