1. a person who endorses a check, promissory note, or other negotiable instrument by signing the back
Usage: legal/financial term; also spelled 'endorser'
2. a person who publicly supports or recommends a product, candidate, or cause
Usage: common in marketing and politics

Examples

• The endorsor signed the back of the check to transfer it to another party.
• As an endorsor of the bill, she added her signature to show her support.
• The celebrity endorsor appeared in advertisements for the new smartphone.
• Each endorsor of the petition agreed to stand behind its demands.
• The bank required the endorsor to guarantee payment if the original debtor defaulted.
• He became a prominent endorsor of environmental protection policies.