Definition of a leap in the dark in English:

a leap in the dark

phrase

  • A daring step or enterprise whose consequences are unpredictable.

    ‘I had taken quite a step—a leap in the dark, in fact’
    • ‘All growth is a leap in the dark, a spontaneous unpremeditated act without the benefit of experience.’
    • ‘But it's not merely a leap in the dark.’
    • ‘But the plan does seem like a leap in the dark - radical measures taken because they might work, not because there is solid reason to believe that they will work.’
    • ‘The proposed re-denomination looks like a leap in the dark, and an exercise in futility that the nation can ill afford now.’