loose cannon
Speech parts
1. loose cannon - Noun
2. loose cannon - Verb
3. loose cannon - Phrase
Meaning
a person who is expected to perform a particular task but who is out of control and dangerous
Source: WordNetSynonyms
Antonyms
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Examples
That was Hera. Her Majesty, the Loose Cannon.
The regional security in the Middle East cannot be further compromised by an Iranian loose cannon.
Courtney Love is a loose cannon. She says what she thinks. She's wild on the red carpet. You get the best sound bites from Courtney Love.
I'm politically inclined towards the left, but I don't like to be in anyone's gang; I'm a bit of a loose cannon.
I don't think I'm made of the right stuff to be a politician. I think I'm made to be a loose cannon.