pickdead letter . dead letter {n. phr.} An undeliverable letter that ends up in a special office holding such letters. There is a dead letter office in most major cities. Categories: add yours noun Source: A Dictionary of American Idioms 'dead letter' on video DEADLETTER - Fall of the Big Screen (Music Video) DEADLETTER - Pop Culture Connoisseur (Live Session) DEAD LETTER CIRCUS - One Step (Official Music Video) Dead Letter sort: relevance, mode: exact match, q: "dead letter", maxResults: 4, videoEmbeddable: true, videoSyndicated: true, safeSearch: strict, type: video Subscribe to: American IdiomsEnglish Slang Add my comment