Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: From the sound of empty talk

blah

1 noun
     
blah1 S2
1

blah, blah, blah

spoken used when you do not need to complete what you are saying because it is boring or because the person you are talking to already knows it:
You know how Michelle talks: 'Tommy did this, and Jesse did that, blah, blah, blah.'
2 [uncountable] British English spoken remarks or statements that are boring and do not mean much:
the usual blah about everyone working harder
3

the blahs

[plural] American English informal a feeling of being sad and bored:
a case of the winter blahs
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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