The Proto-Indo-European word *dʰreu̯gʰ
Word *dʰreu̯gʰ
Meaning to deceive
See also Old Persian: du-u-ru-u-ja ‘to lie, to deceive’
Avestan: druž ‘to lie, to deceive’
Synonyms *kel-, *meng-, *meug-, *(s)mel-, *(s)weig-

Comments
Lith. draugas, Ltv. draugs, ON draugr, Skr. druhyati, Av. družaiti, Eng. drēam/dream, Gm. troum/Traum, Pers. drauga/, Ir. aurddrach/