There are several synonyms for the phrase "tell all" which means revealing everything or disclosing secrets. One of the synonyms is "confess all", which is often used in situations where a person admits to wrongdoings or mistakes. Another synonym is "spill the beans", a phrase that originated from the practice of beans used for voting in ancient Greece. "Bare all" is also used to mean revealing everything, and it is commonly used in contexts such as confessing one's emotions or sharing deeply personal information. Similarly, "open up" can be used as a synonym, especially in situations where one is encouraged to be honest and forthcoming. Other synonyms for "tell all" include "divulge everything" and "share all the details".