An onomatopoeia representing the sound of a sneeze, used in speech and writing to mimic the noise a person makes when sneezing.
English onomatopoeia first widely recorded in the 19th century as a representation of the sneezing sound. Different languages have different versions—French uses 'atchoum,' showing how the same bodily sound gets interpreted differently by different ears.
It's fascinating that languages have different 'words' for the same involuntary sound—your ears and speech patterns trained from childhood make you literally hear sneezes differently. An English speaker hears 'ahchoo' while a French speaker hears 'atchoum,' even if it's the same sneeze.
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