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Pictures taken from Google Images, “A stab in the dark”
Click on the image to listen to the son, “A stab in the dark” by Jade Monkey

Meaning:

If you stab in the dark, you attempt to do something but you cannot actually see the target you are focusing on. If you are trying to answer a question, to take a stab in the dark is just to guess.

Pictures taken from Google Images, “A stab in the dark”
Click on the image to learn how to fake a stab

Origin:

To stab is to attack somebody with a knife. Literally, a stab in the dark is trying to attack someone, whom you cannot see, with a knife. These expression comes from legends in which heroes had to fight with invisible enemies and the only way to defeat them was by stabbing them in the dark.

Pctures taken from Google Images, “A stab in the dark”
Click on the images to watch the video of the song, “A stab in the dark” by Noise

Example:

• -Hi, John. How was your last History exam?
• -It was horrible. I didn´t study anything at all. I didn´t know we had an exam. It all came like a nightmarish surprise.
• -Then, you want to tell me that you didn´t answer any questions.
• -Of course, I did. I answer all the exam but I was just taking educated guesses.
• -So you mean that you were just stabbing in the dark.
•-Well , yes. We could say so.