A dull, flat sound or a blaring horn-like noise without musical quality.
A compound of 'blah' (imitative of dullness) and 'laut' (from German 'Laut,' meaning sound). This 19th-century creation describes unpleasant loud noises.
This is a perfect example of onomatopoeia—the word actually sounds like what it describes! German compound words inspired English speakers to create their own descriptive noise-words.
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