Definition of King of the Castle in English:

King of the Castle

noun

British
  • [mass noun] A children's game in which the object is to beat one's rivals to an elevated position at the top of a mound or other high place.

    • ‘Next we played ‘King of the Castle’, but Pixie won, so it was ‘Ginger Queen of the Castle’ instead.’
    • ‘I went up there with my grand daughter (she's such a little trooper) and we played ‘King of the Castle’ when we reached the peak, surveying our kingdom spread out around us.’