From Longman Dictionary of Contemporary Englishcabooseca‧boose /kəˈbuːs/ noun [countable] American EnglishTTT a small railway carriage at the back of a train, usually where the person in charge of it travels SYN guard’s van British English
Examples from the Corpus
caboose• And not a liberalism that merely acquiesces as it looks to personal advancement, the Clinton caboose.• Trailing that problem like a rattling caboose was the need to tell Spider he was quitting.• The runner was nothing more than the caboose.Origin caboose (1700-1800) Dutch cabuis, from Middle Low German kabuse 