Definition of choo-choo noun from the Oxford Advanced Learner's Dictionary

 

choo-choo

 noun
noun
BrE BrE//ˈtʃuː tʃuː//
 
; NAmE NAmE//ˈtʃuː tʃuː//
 
(pl. choo-choos)
 
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a child’s word for a train Word Origin early 20th cent. (originally US): imitative.
See the Oxford Advanced American Dictionary entry: choo-choo