English

Definition of whereof conjunction from the Oxford Advanced Learner's Dictionary

 

whereof

 conjunction
conjunction
BrE BrE//weərˈɒv//
 
; NAmE NAmE//werˈʌv//
 
(old use or humorous)
 
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of what or which I know whereof I speak (= I know a lot about what I am talking about).
See the Oxford Advanced American Dictionary entry: whereof