n. phr. A random attempt or guess at something without previous experience or knowledge of the subject. "You're asking me who could have hidden grandpa's will," Fred said. "I really have no idea, but let me make a stab in the dark I think my sister Hermione has it."
STAB IN THE DARK
Meaning of STAB IN THE DARK in English
American idioms English vocabulary. Английский словарь американских идиом. 2012