1. 〔騒動〕a disturbance;〔社会的な激変〕an upheaval;〔暴動〕a riot
    • 動乱の二十世紀であった
    • The twentieth century has been full of upheavals.
    • 動乱を起こす[鎮める]
    • start [put down] a riot [disturbance]