dar vueltas

Verb

 * 1) to spin, to rotate, to revolve
 * 2) to go round in circles, to go around in circles
 * 3) to toss to roll around as in restless sleep in bed
 * 4)  to brood on, to chew on, to mull over, to go over
 * 1)  to brood on, to chew on, to mull over, to go over