The term 'Ready to Rumble' is a phrase used to describe someone who is prepared for a fight or confrontation. The crossword solutions for this phrase are ARM (3 letters), ARMED (5 letters), and UPINARMS (8 letters). ARM is an acronym for 'Active Resistance Movement' and is also a verb meaning to equip with weapons. ARMED is the past tense of the verb ARM, meaning to have been equipped with weapons. UPINARMS is an adjective describing someone who is ready to fight or confront.