noun

1. violent disturbance or commotion, esp. one accompanied by loud, confused noise, as of shouting; tumult
2. loud, confused noise; din

Etymology: Du oproer, a stirring up (akin to Ger aufruhr) < op, up + roeren, to stir (akin to OE hreran < IE base *ere-, to mix, stir up): form and sense infl. by roar