Briticism

 
Pronunciation: /ˈbrɪtɪsɪz(ə)m/
(also Britishism /-ʃɪz(ə)m/)

noun

  • an idiom used in Britain but not in other English-speaking countries: ‘Toy boy’ is a Briticism for a ‘gigolo.’

Origin:

mid 19th century: from British, on the pattern of words such as Gallicism