The antonyms for the phrase "beginning where left off" would be "ending and starting anew," or "stopping completely." When someone begins where they left off, it implies that there is continuity and progression in their actions or work. However, ending and starting anew refers to a clear break in the process, with a fresh start being made. Stopping completely, on the other hand, means that the work or task has been abandoned entirely. It is important to understand these antonyms, as they give insight into the different possible approaches and outcomes of a particular project or activity.