loose cannon
noun [ C ] disapproving uk/ˌluːs ˈkæn.ən/ us/ˌluːs ˈkæn.ən/
喜欢惹是生非的人，爱招惹麻烦的人；举止无法预料的人
someone who behaves in an uncontrolled or unexpected way and is likely to cause problems for other people
He's seen as something of a loose cannon by other team members. 在其他队员看来，他是个有点爱惹麻烦的人。
I don't think we can take a risk on a loose cannon like him running our country.
- More examples
- The eldest son was seen as the loose cannon in the family.
- Loose cannons like Lizzie can't be relied upon.
- Taylor is more of a loose cannon - sometimes he'll fly into rages, cry uncontrollably, engage in risky behaviour.