Definition of maun in English:

maun

modal verb

British
dialect
  • ‘now I maun stay’
    variant form of must
    • ‘The organiser of the affair insists the show maun go on.’
    • ‘I say we maun maintain Mary safely on this throne.’
    • ‘I maun congratulate them on their marriage last Friday.’
    • ‘Thomas, you maun hold your tongue.’
    • ‘The auld boy maun have been dreaming.’

Origin

Late 15th century: an alteration of earlier mun.

Pronunciation

maun

/mɔːn/