The phrase "all one born day" typically means a person's entire life or existence. When it comes to finding antonyms for this expression, we must look at opposing concepts. Some antonyms for "all one born day" include fleeting, temporary, short-lived, or ephemeral. These terms suggest something that is momentary, brief or short-lived. On the other hand, everlasting, perpetual or eternal could be considered antonyms, as these terms indicate something that will endure forever. Other possible antonyms may include finite, limited, or definite, alluding to something that is restricted, confined or confined to a specific duration.