have an axe to grind

 have an axe to grind

= to have a personal motive or agenda that influences someone's opinions or actions

 

When Peter criticizes the new pension policy, I believe he has an axe to grind because he stands to benefit from the old policies.

Many voters think that the senator has an axe to grind when he criticizes the new tax reforms, as he has significant investments in companies that benefit from the old laws.

After losing the championship, the coach expressed his frustrations about the referees, suggesting he has an axe to grind given their previous decisions.

The journalist's relentless coverage of the scandal makes me think he has an axe to grind against the organization involved.

Some synonyms and antonyms for the phrase "have an axe to grind":

Synonyms:

Have a hidden agenda

Have a personal stake

Have a vested interest

Have a bone to pick 

Antonyms: 

Be objective

Be neutral

Be unbiased

Be disinterested

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