cold turkey noun 3adverb 1verb 1forms 3 noun3 •The physiological effects of such a withdrawal. •(informal) A sudden and complete withdrawal from a dependent substance, especially a drug. •(US, slang) Something exposed as a target due to surmountable defense. adverb1 •Not gradually; all at once; referring especially to quitting a habit by force of will rather than by a gradual reduction.It is difficult, but possible to quit smoking cold turkey. verb1 •(informal) To undergo sudden and complete withdrawal from a dependent substance, especially a drug. formscold turkeyed · cold turkeying · cold turkeys