Etymology
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quitter (n.)

as an insult, "one who shirks or gives up," by 1878, American English, in reference to race horses, agent noun from quit (v.) in the "stop, cease" sense. It is attested by 1871 as "one who gives up (chewing tobacco)."

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Definitions of quitter

quitter (n.)
a person who gives up too easily;
From wordnet.princeton.edu