The country has been roiled by a series of serious cultural and religious transgressions at the hands of U.S. troops.
The partisan sniping over the rich vs. the middle class that has roiled the debt talks will define the 2012 election.
But the timing of his departure points to a potential tipping point that over the course of last week has roiled the White House.
1580s, of uncertain origin, probably from Middle French rouiller "to rust, make muddy," from Old French roil "mud, muck, rust" (12c.), from Vulgar Latin *robicula, from Latin robigo "rust" (see robust). An earlier borrowing of the French verb is Middle English roil "to roam or rove about" (early 14c.). Related: Roiled; roiling.