1. thumb wrestling
Wikipedia definition
2. Thumb warA thumb war or thumb wrestling is a children's game played by two players in a tournament called a thumb-a-war (or thumb war) using the thumbs to simulate fighting. The object of the game is to pin the opponent's thumb, often to a count of three. The San Francisco Chronicle called the game "the miniature golf of martial sports. " The players face each other and each holds out their left hand or right hand in a "thumbs up", and they link hands in a monkey grip.
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Read “指相撲” on Japanese Wikipedia
Read “Thumb war” on DBpedia


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