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A very polite and friendly expression of gratitude to someone (for something). A: "Here are the documents you asked for, Mr. Lubbock." B: "Thanks kindly, Sarah." A: "That's a really nice dress, Mrs. Marshal." B: "Aw, that's so sweet—thanks kindly, Billy!"
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.