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Phrase(s): bread-and-butter letter
a letter or note written to follow up on a visit; a thank-you note. • When I got back from the sales meeting, I took two days to write bread-andbutter letters to the people I met. • I got sort of a bread-and-butter letter from my nephew, who wants to visit me next summer.
McGrawhill's American Idioms And Phrasal Verbs