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to have an axe to grind
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- to criticize someone
- to fail to arouse interest
- to work for both sides
- to have a selfish end to serve
Correct Option: D
to have an axe to grind : to have private reasons for being involved in something Look at the sentence :
● He had no axe to grind and was only acting out of concern for their safety. Here, to have a selfish end to serve is the right option.