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chin-up (n.)
[chin-up 词源字典]
also
chinup
, type of exercise, 1951, from
chin
(v.) +
up
(adv.). Earlier it was called
chinning the bar
and under names such as this is described by 1883.
[chin-up etymology, chin-up origin, 英语词源]
[chin-up 词源字典]