be whistling in the dark

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be whistling in the dark

To be sure of a particular outcome when all evidence points to the contrary. Based on the polls, he's whistling in the dark if he thinks he's going to unseat the incumbent. He never pays any attention to you, so you're whistling in the dark if you think he's really going to ask you out on a date.
See also: dark, whistle

be whistling in the dark

to be confident that something good will happen when it is not at all likely She seems pretty sure she'll win the title, but she may just be whistling in the dark.
See also: dark, whistle