Definition of tell-all adjective from the Oxford Advanced Learner's Dictionary

 

tell-all

 adjective
adjective
BrE
 
; NAmE
 
[only before noun] Celebrity news
 
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(of a book, an interview in a newspaper or magazine, etc.) in which somebody, usually somebody famous, admits something that may shock people a tell-all book/memoir/autobiography See related entries: Celebrity news
See the Oxford Advanced American Dictionary entry: tell-all