What does it mean, "to have an axe to grind"?

ONE-MINUTE ENGLISH: have an axe to grind

Have An Axe to Grind Idiom Meaning

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What does an axe to grind mean?

{Learning English Daily}/Have an axe to grind/#210

【P5S】Axe to Grind 歌詞・日本語訳字幕あり【MAD】【ペルソナ５ スクランブル ザ ファントム ストライカーズ】

an axe to grind | Idioms and Phrases | Meaning and Sentence

An axe to grind: By the U.S Forest Service

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