Webster's English Dictionary

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uproar

up.roar \'*p-.ro-(*)r, -.ro.(*)r\ n [by folk etymology fr. D oproer, fr. 
   MD, fr. op up + roer mot]ion; akin to OE u-p up and to OE hre-ran to stir : 
   a state of commotion, excitement, or violent disturbance