41. Turn, revolve, rotate, spin indicate moving in a more or less rotary, circular fashion. Turn is the general and popular word for motion on an axis or around a center, but it is used also of motion that is less than a complete circle: A gate turns on its hinges. Revolve refers especially to movement in an orbit around a center, but is sometimes exchangeable with rotate, which refers only to the motion of a body around its own center or axis: The moon revolves about the earth. The earth rotates on its axis. To spin is to rotate very rapidly: A top spins.
88. Turn, cast, twist are colloquial in use and imply a bent, inclination, or habit. Turn means a tendency or inclination for something: a turn for art. Cast means an established habit of thought, manner, or style: a melancholy cast. Twist means a bias: a strange twist of thought.

Did you mean turn on?