Definition of no-no in English:

no-no

noun

informal
  • A thing that is not possible or acceptable.

    ‘perming highlighted hair used to be a definite no-no, but it's now possible’
    • ‘The first rays of the morning sun can do terrible damage, so an east-facing wall is a definite no-no.’
    • ‘Is plagiarism a moral and ethical crime or just a naughty no-no?’
    • ‘Whether you're grabbing a meal on the run or topping up on a long drive, eating and driving is an absolute no-no.’
    • ‘Since he also caters for kids, obscenities and alcohol are a complete no-no.’
    • ‘Wiggling out was a definite no-no since he had already made sure that I had nowhere else to turn to.’
    • ‘So an office at that end of the building is a definite no-no as the droning hum could drive me mad.’
    • ‘Dirt and grease under the fingernails is a no-no, as it detracts from a woman's jewellery and alters the taste of finger foods.’
    • ‘That sort of event was a definite no-no and he worked hard to prevent such things.’
    • ‘This is a definite no-no if you're looking for quality protein to add to your active lifestyle.’
    • ‘Traditional wisdom says that if you care about fat and pounds, then ice cream is a definite no-no.’
    • ‘It took me all of five minutes, for example, to conclude that high-waisted trousers and Botox are a definite no-no.’
    • ‘Compromising an intelligence source for political gain is a huge no-no.’
    • ‘There were some people putting ropes on the whales and the wildlife officials say that's a no-no.’
    • ‘Chinese eateries are usually associated with pork, and that is a no-no for Muslims.’
    • ‘It sounded inviting, but I was told that swimming with the manatees was a no-no.’
    • ‘Is it OK with everyone if we discuss the particulars or is that a no-no?’
    • ‘Smoking is a definite no-no, while alcohol consumption should be kept at sensible limits.’
    • ‘The embarrassment concluded with his attempt to kiss Princess Anne's hand, a royal no-no.’
    • ‘Biker jackets and high-tech styling are trends that might seem like a no-no for adults.’
    • ‘He adds that typographical errors, hand written documents and bad grammar are major no-nos.’

Pronunciation:

no-no

/ˈnō ˌnō/