evil eye

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A look or stare believed to cause injury or misfortune to others.
• noun The presumed power to cause injury or misfortune to others by magic or supernatural means.

from the GNU version of the Collaborative International Dictionary of English.

• See Evil eye under evil, a.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A wicked look
• noun A curse

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a look that is believed to have the power of inflicting harm