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nighthawk
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n. a recurring though that only seems to strike you late at night—an overdue task, a nagging guilt, a looming future—which you sometimes manage to forget for weeks, only to feel it land on your shoulder once again, quietly building a nest.
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Nighthawks is a famous painting by Edward Hopper, depicting a lonely corner dinner late at night. In logging, a nighthawk, is a metal ball that slid up and down a riverboat's flagpole, to aid pilots in navigation.