electric power source, power supply / power outlet, power socket

change one's methods or ways of thinking

switch, a device to turn electric current on and off or direct its flow / (rail transport) switch of a railroad, point of a railroad / a change in method or thinking / (computing) network switch

to cut, to slice, to carve / cut down, fell, chop down / prune, trim, shear / cut flat things such as cloth or paper / cut a person with a sword, cut down, kill

finish, be through / perform an action thoroughly or decisively

switching off

to switch off, to turn off

switching on

to switch on, to turn on

(literally) a switch is flipped / (by extension) someone's mood or thinking changes, as if a switch is flipped in their mind