Answer:

roils

AnswerCrossword Clue
ROILSStirs up
ROILSChurns
ROILSChurns up
ROILSIs turbulent
ROILSAgitates
ROILSShakes up
ROILSMuddies
ROILSStirs
ROILSMuddies up
ROILSDisquiets
ROILSMuddies the water