grind (one's) axe

Translations
иметь корыстный интерес
She really seems to have an axe to grind against the new manager.
Похоже, у неё свои интересы против нового менеджера.
Definitions
To have a personal, often hidden, reason or grievance for pursuing a particular topic or action, usually with the intention of benefiting oneself or settling a score.
Words
grind

verb
точить
one's

pronoun
свой
axe

noun
топор