the.com/endorsement
A public thumbs-up that loans your reputation to someone else's gamble.
means A formal statement of approval or support for a person, product, or idea, lending it your credibility.
from From Latin in dorsum, on the back — literally what you wrote on the back of a document or check to vouch for it.
Still literalSigning a check's back is endorsing it.
Celebrity mathStar endorsements can lift sales without any logic.
Political ritualNewspaper endorsements rarely change how anyone votes.