Which of these brand names successfully became a generic verb in English dictionaries, despite the company's initial efforts to protect their trademark?

In the world of language and linguistics, companies often create innovative terms that eventually become part of our everyday vocabulary. These linguistic innovations serve as powerful brand strategy tools, creating unique product identities while enriching our language. This trivia question explores how one company's product name transformed from a trademarked term to a common verb in modern language - a fascinating case study in how commercial language can shape our everyday communication.

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Google (to google)
Kleenex (to kleenex)
Photoshop (to photoshop)
Spotify (to spotify)