whistle in the dark

Whistle in the dark is an idiom which means to guess aimlessly where you have no idea what the answer could be, or to speculate as to a fact of something when you dont know the truth of it. Whistling in the dark is referring to being somewhere you cant see a thing, and whistling for someone or something, that you cant at all see. The phrase is used figuratively to describe a situation where you dont know the answer, but guess anyway