The story
- Latin · derived fromfidēprōmissor“guarantor, surety”
- English todayfidepromissor
From Latin fidēprōmissor (“guarantor, surety”), from fidēprōmittō (“make a promise on behalf of another person, stand as guarantor or surety”) + -tor, from fidē (“in faith”) + prōmittō (“promise”) + -or (“agent suffix”).
Etymology from Wiktionary, CC BY-SA 4.0.