English version

leap in the dark

From Longman Dictionary of Contemporary Englishleap in the darkleap in the darkRISKsomething you do without knowing what will happen as a result leap
Examples from the Corpus
leap in the darkCritics also worry that compassionate conservatism is a leap in the dark without any empirical evidence to back it up.The man who hopes to be Chancellor next week can not surely be preparing a leap in the dark.Ten minutes later - another leap in the dark - he offered the appointment to Churchill.
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