Definitions
1.NounA hex; an evil spell.
2.NounA person or thing supposed to bring bad luck.
3.VerbTo cast a spell on.
4.VerbTo bring bad luck to.
5.VerbTo cause something to happen by mentioning it. Often used sarcastically.
6.VerbTo cause a bad outcome through verbal expression of certainty about a good situation or result. See knocking on wood, which is supposed to mitigate this effect.
7.InterjectionUsed after the same thing is said by two people simultaneously.