carrier pigeon
Longman Dictionary of Contemporary English 5++LDOCE 5++ˈcarrier ˌpigeon noun [countable] HBBa pigeon (=type of bird) that has been trained to carry messages 信鸽
Examples from the Corpus
carrier pigeon• The first correct entry to be drawn at random will be notified by phone and the Guitarist carrier pigeon will do the rest.ˈcarrier ˌpigeon nounChineseSyllable
trained been has of to (=type a pigeon Corpus that bird)
carrier pigeon
ˈcarrier ˌpigeon
noun [countable]
a pigeon (=type of bird) that has been trained to carry messages
ˈcarrier ˌpigeon
noun [countable]a pigeon (=type of bird) that has been trained to carry messages