take a stab in the dark

(verb) to take a complete guess

Example Sentences:

A: Do you know how old I am?
B: I’m going to take a stab in the dark and say….35?
A: I’m 17!

When Guillaume asked me to name the capital of the Netherlands, I took a stab in the dark and said Amsterdam.

A: Excuse me, do you know what time the bus will arrive?
B: I’m taking a stab in the dark, but I think it comes at 12:05.

From the Blogs:

Financial Bailout “A Stab in the Dark“

Media:

Similar idioms:

1. take a stab at
2. excuse my French
3. make up an excuse