How do you say "to get back at someone"? Is it 找晦氣 or 找負氣? According to CantoDict, 找晦氣 in Cantonese means, "to get back at someone or cause trouble over a past grievance". Link: http://www.cantonese.sheik.co.uk/dictionary/words/50994/

CantoDict is sometimes wrong since it is edited by volunteers.

Wouldn't 找負氣 make more sense instead of 找晦氣 because 負氣 means to act out of stubbornness or irritation whereas 晦氣 means unlucky or gloomy.

Which is correct?
找晦氣 is correct.

你得罪咗佢，佢实找你晦气[你得罪了他，他一定会来报复的] 。