jinx
🇺🇸
/dʒɪŋks/
🇬🇧
/dʒɪŋks/
To cause something bad to happen, often by saying something positive about it.
Don't talk about the good things happening, you might jinx it.
A person or thing believed to bring bad luck.
The team thinks the new player is a jinx because they've been losing since he joined.