Definition of balderdash noun from the Oxford Advanced Learner's Dictionary

 

balderdash

 noun
noun
BrE BrE//ˈbɔːldədæʃ//
 
; NAmE NAmE//ˈbɔːldərdæʃ//
 
[uncountable](old-fashioned)
 
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nonsense Word Origin late 16th cent. (denoting a frothy liquid; later, an unappetizing mixture of drinks): of unknown origin.
See the Oxford Advanced American Dictionary entry: balderdash