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Noun: choo-choo  'choo'choo
Usage: informal
  1. A child's word for locomotive
    "The toddler pointed excitedly at the passing train and shouted 'choo-choo!'";
    - choo-choo train [informal]

Derived forms: choo-choos

Type of: engine, loco [informal], locomotive, locomotive engine, railroad locomotive [N. Amer], railway locomotive [Brit, Cdn]