Definition of idiot board in English:

idiot board

(also idiot card)

noun

informal
  • A board displaying a television script to a speaker as an aid to memory.

    • ‘It's so predictable, you expect idiot cards - LAUGH, FEEL MUSHY, APPLAUD - to flash across the screen.’
    • ‘With Peter, I was slightly worried because I had heard stories from friends who worked on the Harry Potter films about Richard Harris being [drunk], having to have huge idiot boards and earpieces, and having had temper tantrums.’
    • ‘‘Subterranean Homesick Blues’ plays on the soundtrack, while a flawlessly deadpan Dylan holds up idiot cards with phrases from the lyrics scrawled on them, so you can get the message.’

Pronunciation:

idiot board

/ˈidēət ˌbô(ə)rd/