From Longman Dictionary of Contemporary Englishjinxjinx /dʒɪŋks/ noun [singular] UNLUCKYsomeone or something that brings bad luck, or a period of bad luck that results from this The company had suffered so many disasters that some employees feared a jinx.
Examples from the Corpus
jinx• Contrary to all that gar-bage about being a jinx, she brought me nothing but good luck.• They reckon it's a jinx after last night.• This weekend they all want to end the January jinx.• Now she's waiting for Wimbledon and a chance to beat her second round jinx.• Muttering some vulgar exorcism to avert the jinx, Juron tore the panel open.Origin jinx (1900-2000) Perhaps from jynx type of bird used in doing magic ((17-19 centuries)), from Greek iygx 