evil eye

Short definition from Wiktionary

Noun

1. 1
   A wicked look conveying dislike or envy that in many cultures is believed to be able to cause bad luck or injury; also, the ability to cause bad luck or injury through such a look, supposed to be possessed by some people.
2. 2
   The charm used to ward off the evil eye; a nazar.
3. 3
   A look conveying disapproval, envy, hostility, etc.

Verb

1. 1
   to cast an evil eye upon someone or something