A child's word or informal name for a train or steam locomotive, imitating the sound the train makes.
From onomatopoeia; this word mimics the sound of a steam locomotive's exhaust ('choo-choo'). It emerged in the late 1800s when trains became a common part of everyday life.
'Choochoo' is one of the few English words we know was intentionally created to sound like something—it's onomatopoeia that became so popular with children that it entered the dictionary as a real word, showing how language evolves through imitation.
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