noun
a person who engages in illegal or unauthorized nighttime activities, such as trespassing or theft
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The authorities have been cracking down on nighthawkers who illegally search for artifacts at archaeological sites.
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I heard that nighthawker got caught red-handed digging up stuff at the park last night.
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Don't be a nighthawker and try to sneak into the concert without a ticket.
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He was a nighthawker in the world of finance, always looking for ways to make a quick profit.