köken: From Middle French merci, mercy, from Old French merci, from Latin mercēdem (“wages, fee, price”). Used as an interjection of gratitude since at least the early 12th century, originally as grand merci, for instance spelled granz merciz in Li coronemenz Looïs.
aile: Dieu merci, merci beaucoup, merci bien, merci mille fois, merci pour ton aide, merci pour votre aide, non merci