1. (colloquial, often, childish) Something that is forbidden, prohibited, discouraged or taboo.
    Smoking indoors is becoming a real no-no these days, in many places.
  2. (baseball, colloquial) A no-hitter; a game in which no batter on one of the teams got a hit.
    He threw two no-nos in his career.
  • (something forbidden, ...) must

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Offline English dictionary