turn on

To set a flow of fluid or gas running by rotating a tap or valve.

To power up, to put into operation, to start, to activate (an appliance, light, mechanism, functionality etc.).

To start operating; to power up, to become on.

To introduce (someone to something), and especially to fill them with enthusiasm (about it); to intoxicate, give pleasure to ( + to an object of interest or excitement).

To sexually arouse.

To take drugs.

To cause to take up drugs, especially hallucinogens.

To aim at.

To rebel against; to suddenly attack.

To cause (someone) to rebel against or suddenly attack (someone else).