One at a time is a phrase that refers to doing things individually or sequentially. Some synonyms for this phrase include single-handedly, individually, separately, and sequentially. Doing things one by one means giving full attention to each task and completing it before moving on to the next one. This approach is beneficial in maintaining focus, reducing errors, and achieving better results. Other synonyms that could be used in place of one at a time include systematically, methodically, and step by step. These words convey the sense of doing things in an organized and structured way and help to break down complex tasks into manageable parts.