What is the definition of Endorsement Weapon?

An 'endorsement weapon' is like a superhero sidekick, but instead of cape and cape-waving, it's a persuasive endorsement. It's that one ad or testimonial that can turn a potential customer into a loyal fan, or in extreme cases, make them question their own choices.

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Here's an edgy example sentence: "Just saw this endorsement weapon from the 'organic' brand, and I'm convinced my life is about to get a whole lot sweeter... or maybe just more toxic."