Public statements of support or approval for a person, product, or idea; signatures or written agreements on the back of a document.
From Old French 'endosser,' literally meaning 'to put on the back' (en- + dos, back). It evolved from writing on document backs to expressing public support.
When a celebrity endorses a product, they're literally putting their reputation 'on the back' of it—which is why one bad scandal can topple a multimillion-dollar advertising campaign!
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