Which of these language learning product slogans was so successful that it became the company's trademarked name and revolutionized the language education market?

The Oxford English Dictionary (OED) regularly adds new words that began as brand names but evolved into common language. These 'genericized trademarks' reflect how product marketing can permanently alter linguistics. Some brands actively fight this language evolution to protect their trademarks, while others embrace the cultural impact. Test your knowledge about this fascinating intersection of product marketing and linguistic evolution!

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"The fastest way to learn a language guaranteed™" (Rosetta Stone)
"Language learning, gamified" (Duolingo)
"Learn a language in 30 days" (Berlitz)
"The language learning system that works with your brain" (Pimsleur)