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1. A one-man war is when one person fights against an opponent consisting of several people by himself/herself.

2. It can also be used figuratively, to say a person is fighting against a matter that other people supports by himself/herself, at least with a lack of support for his/her opinion.
1. "He launched a one-man war against police."

2. "He launched a one-man war against graffiti."
by youngchimp November 29, 2012
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