Etymology
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cold turkey

"without preparation," 1910; narrower sense of "withdrawal from an addictive substance" (originally heroin) first recorded 1921. Cold turkey is a food that requires little preparation, so "to quit like cold turkey" is to do so suddenly and without preparation. Compare cold shoulder. To do something cold "without preparation" is attested from 1896.

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Definitions of cold turkey

cold turkey (n.)
a blunt expression of views;
I told him cold turkey
cold turkey (n.)
complete and abrupt withdrawal of all addictive drugs or anything else on which you have become dependent;
he quit smoking cold turkey
she quit her job cold turkey
From wordnet.princeton.edu