ETYM From mutine to mutiny, from French se mutiner, from French mutin stubborn, mutinous, from Old Fren. meute riot, Late Lat. movita, from movitus, for Latin motus, p. p. of movere to move. Related to Move.
Open rebellion against constituted authority (especially by seamen or soldiers against their officers).
Organized act of disobedience or defiance by two or more members of the armed services. In naval and military law, mutiny has always been regarded as one of the most serious of crimes, punishable in wartime by death.

To engage in a mutiny against an authority.