Definition of thunderbox in English:

thunderbox

Line breaks: thun¦der|box
Pronunciation: /ˈθʌndəbɒks
 
/

noun

British informal
A primitive or makeshift toilet.
More example sentences
  • He sends in a message on a piece of loo roll (honestly, it's true) suggesting he had tried the sandwich and ‘I'm still in here (the thunderbox)!’
  • On at least one noxious occasion Mad Max barked orders to her as he sat astride a thunderbox, a horrendous experience for anyone of a sensitive disposition.
  • When they tore ivy full of birds' nests from the walls, they replaced it with 36 sparrow boxes; the thunderbox loo has an inbuilt heater.

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