Many Thanks
"Many thanks." Many Thanks It is not many thanks. It is "Thanks a lot"
Contemporaneous, colloquial and unconfounded of imagery; no etymology
This is a line from the James Cagney film, "Yankee Doodle Dandy" (1942)
it means " i appreciate it but no thank you"
Art of the Thank-You Note
Top 5: Tech to be Thankful for
Sending Thank-You Notes Etiquette by Email After a Job Interview
Child Manners - Thank You Notes