The phrase "final twitch" can be replaced with several synonyms depending on the context. In the medical field, it is common to use "death spasm" or "terminal convulsion" to describe the last involuntary movements of a dying person. In sports, "last ditch effort" or "final push" are often used to describe the last attempt made by a team or player to win a game. In writing or speaking, "concluding gesture" or "final movement" can effectively convey the idea of a last movement or action before something comes to an end. Ultimately, choosing the appropriate synonym for the phrase "final twitch" depends on the situation and intended message.