To make (a liquid) muddy or cloudy by stirring up sediment.
To displease or disturb; vex: My roommate's off-putting habits began to roil me.
To be in a state of turbulence or agitation.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.