- The definition of achoo is a word used to represent the sound that people make when they sneeze.
An example of achoo is the sound someone makes when they have a head cold right before someone says 'Bless you'.
This woman says "achoo!"
used to suggest or imitate the sound of a sneeze
- (onomatopoeia) The sound of a sneeze.
- Achoo - I think I'm coming down with something!