Take up arms is a phrase that refers to the act of taking up weapons in order to fight or REVOLT against an oppressive force. The two crossword solutions for this phrase are REVOLT (6 letters) and REBEL (5 letters). REVOLT and REBEL are both terms used to describe a person or group of people who rise up against an authority or government in order to gain freedom or rights. This act of resistance is often done through the use of violence or armed conflict.