be spitting in(to) the wind

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be spitting in(to) the wind

To be doing something totally pointless, fruitless, or futile; to be wasting one's time doing something that will not or cannot come to pass. To be perfectly honest, when I vote, I feel like I'm spitting in the wind, so I usually don't bother. If you're trying to lose weight without changing your diet, you're spitting into the wind.
See also: spit, wind