to move round in circles or spirals

revolve

to make (a written agreement, guarantee etc) not valid

render null and void

to go round in a circle; to think about all sides of (a problem etc)

turn, circle

(to cause something) to move round a central point; (to cause something) to take place in succession

go around in circle

a place where a road turns, especially where one road branches off from another

revolve, curve