Etymology
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chin-up (n.)

also chinup, type of exercise, 1940, from chin (v.) + up (adv.). Earlier it was called chinning the bar and under names such as this is described by 1883.

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Definitions of chin-up

chin-up (n.)
an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar;
Synonyms: pull-up
From wordnet.princeton.edu