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Definition of Choo-choo
1. Noun. A child's word for locomotive.
Definition of Choo-choo
1. Noun. (childish) The sound made by a steam locomotive. ¹
2. Noun. (childish) A railway locomotive. ¹
3. Noun. (childish) A railway train. (Also called a choo-choo train) ¹
¹ Source: wiktionary.com