Plural of Boston; multiple games or instances of the card game 'Boston', a trick-taking game for four players.
From 'Boston' (the game), likely named after the city. The game was particularly popular in 19th-century drawing rooms and genteel society.
The card game Boston was so popular among wealthy people that the city became associated with it—it's one of those historical facts that shows how games spread culture and become linked to places.
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