jinx v. t. To bring bad luck to; to cause to malfunction or go wrong; as, some superstitious people are reluctant to predict success for fear it will jinx them. (Slang)
noun
jinx n. A person, object, influence, or supernatural being which is supposed to bring bad luck or to cause things to go wrong. (Slang)
... him who thinks The world is jonahed by a jinx; That everything is sad and sour, And life ... — Something Else Again • Franklin P. Adams
... almost had a shrug in it. "Don't jinx our luck, twin brother," he said. "For that matter, how long will we last...? Mex, did you ... — The Planet Strappers • Raymond Zinke Gallun
... like it in my life!" snorted Tom. "It's as though we were all bewitched. Somebody's wished a jinx on us. Some ghosts are putting up ... — Army Boys on German Soil • Homer Randall