jinx
nounA person or thing that is believed to bring bad luck.
nounA condition or period of bad luck that appears to have been caused by a specific person or thing.
transitive verbTo bring bad luck to.
nounA person, object, influence, or supernatural being which is supposed to bring bad luck or to cause things to go wrong.
transitive verbTo bring bad luck to; to cause to malfunction or go wrong.
nounA
A person or thing supposed to bring
To
To bring
Used after the same response is said by two people simultaneously. Often, a game is played where the person who failed to say “jinx” first becomes “jinxed”, whereby they cannot speak until someone says their name.