Which dictionary brand created the famous 'Pronunciation' ad campaign where people avoided embarrassment by correctly pronouncing challenging words?

In the world of language and linguistics, branding plays a crucial role in how companies communicate their identity. Linguistic elements in slogans and brand names can significantly impact consumer perception and recall. This trivia question explores how a major dictionary brand leveraged linguistics to create one of the most memorable advertising campaigns in publishing history.

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Merriam-Webster
Oxford English Dictionary
Cambridge Dictionary
Macmillan Dictionary