On the dot refers to doing something at a precise and punctual time. There are many other phrases that can be used to convey the same meaning. Some common synonyms for "on the dot" include "exactly," "precisely," "promptly," "punctually," "sharp," "at the stroke of," "right on time," and "to the minute." Using these synonyms can help add variety and interest to your writing or speech, while still conveying the same message. Whether you're referring to a meeting, event, or deadline, using these synonyms can help emphasize the importance of punctuality and ensure that everyone is on the same page.