pickbread-and-butter letter . bread-and-butter letter {n.} A written acknowledgment of hospitality received. Jane wrote the Browns a bread-and-butter letter when she returned home from her visit to them. Categories: add yours noun Source: A Dictionary of American Idioms 'bread-and-butter letter' on video The Bread and Butter Letter : Sarah & Rose The Last Letter Bread and Butter Letter on Lots of Littles Learn English: Daily Easy English 0924: my bread and butter sort: relevance, mode: exact match, q: "bread-and-butter letter", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Post my comment