動詞
假借公事報復私人恩怨 to retaliate in work or official matters out of personal spite
公報私仇唔係君子所為。
公报私仇唔系君子所为。
gung1 bou3 si1 sau4 m4 hai6 gwan1 zi2 so2 wai4. Retaliating in official matters out of personal spite is not what a gentleman does.
Definitions (Wiktionary)
phrase, idiomatic
to use one's official position to avenge a personal grudge