The act of striking someone with a blackjack weapon, or engaging in violence with this weapon.
Present participle/gerund form of 'blackjack,' created by adding '-ing.' Describes the ongoing action of attacking with a blackjack.
In the early 20th century, 'blackjacking' was so common in certain cities that newspapers regularly reported on it as a crime epidemic, and some cities actually temporarily banned the possession of blackjacks to stop the violence—a weapon so dangerous it became illegal just to own.
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