American EnglishAmETTT a small railway carriage at the back of a train, usually where the person in charge of it travels 守车〔在列车末尾供列车长使用的车厢〕SYN British English guard’s van
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.
Origincaboose
(1700-1800)Dutchcabuis, from Middle Low Germankabuse