"At dawn" is a commonly used phrase that refers to the early hours of the day when the sun is just beginning to rise. There are several synonyms for this phrase that can be used to add variety and depth to your writing. Some of these synonyms include "daybreak," "sunrise," "first light," "crack of dawn," "morn," "dawning," "early in the morning," and "morning light." Each of these phrases conveys the same meaning as "at dawn," but can be used interchangeably depending on the context and style of writing. Using synonyms can help to enhance the clarity and variety of your writing, making it more interesting and engaging to read.