The punch carried tremendous force, and his opponent went down on the spot.
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钧 is an ancient weight of thirty 斤, so a thousand jun stands for a crushing weight. The word lives on in 千钧一发 'a thousand jun hanging by one hair', a moment of extreme danger, and in Mao's line 金猴奋起千钧棒 'the Golden Monkey raises his mighty cudgel'.
