Third person singular present form of endorse; to publicly declare support for or approve of something.
Present tense form of 'endorse,' from Old French 'endosser.' The base word evolved from the literal action of writing on the back (dorsum) of a document to the modern meaning of public support.
When a celebrity endorses a product, they're doing what medieval merchants did with checks—putting their name on something to say 'I approve of this and put my reputation behind it.'
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