bless you

Interjection

1. (idiomatic) Said to someone who has just sneezed, as a polite remark.

   Synonyms:

   gesundheit

2. (humorous, idiomatic) Used to express non-understanding of someone who has just used an unusual or foreign word or phrase (as if to imply that it sounds like a sneeze).
   • ‘What’s that?’ said Ron, pointing at a large dish of some sort of shellfish stew that stood beside a large steak-and-kidney pudding.
     ‘Bouillabaisse,’ said Hermione.
     ‘Bless you,’ said Ron.
     ‘It’s French,’ said Hermione. ‘I had it on holiday, summer before last, it’s very nice.’2000 July 8, J. K. Rowling [pseudonym; Joanne Rowling], “The Goblet of Fire”, in Harry Potter and the Goblet of Fire (Harry Potter; 4), London: Bloomsbury Publishing, →ISBN, page 221