Related Clues:

• 'Mission aborted'
• Nixed, at NASA
• Don't do it
• It's strictly taboo
• Forbidden-zone description
• Taboo thing
• Canceled, as a mission
• Canceled, as in rocket launch
• ''___, Nanette''
• Rich dessert, to a dieter
• Putting regular gas in a diesel engine, e.g.
• Inoperative, as a launch
• It's to be avoided
• Canceled, to NASA
• It's taboo