achoo1
/əˈtʃuː/(also ahchoo)
verb
[no object] To make the sound ‘achoo’; to sneeze.
Origin
Late 19th century; earliest use found in The Chicago Daily News. From achoo.
achoo2
/əˈtʃuː/exclamation
Representing the sound of a sneeze.
noun
An exclamation of ‘achoo’; a sneeze.
Origin
Mid 19th century; earliest use found in Lloyd's Penny Weekly Miscellany. Imitative of the sound made when sneezing.