undie /ʌnˈdaɪ̯/verb 2/ˈʌndi/ noun 2forms 3 verb2 •To come back to life after having died. •To become undead. undie /ˈʌndi/ noun2 •[before a noun] (informal) Underwear.Here are a few pointers from an undie-snatching master. — 1999 •(informal) A spy, undercover agent.I've got mad hate for the undies Moving like gyal, tryna cuff me — 2016 formsundied · undying · undies