Someone who’s been with you since the beginning and generally supports you. (Could be from the beginning of a certain period of time or situation.)
My Mom has been with me all my life. She is my A one from day one.
John is my A one from day one. We started this job at the same time.
John is my A one from day one. We started this job at the same time.
by LiteBrite169 December 22, 2021
Get the A one from day onemug.