1.
When you turn on a piece of equipment or a supply of something, you cause heat, sound, or water to be produced by adjusting the controls.
I want to turn on the television...
She asked them why they hadn’t turned the lights on.
= switch on
≠ turn off
PHRASAL VERB : V P n (not pron) , V n P
2.
If someone or something turns you on , they attract you and make you feel sexually excited. ( INFORMAL )
The body that turns men on doesn’t have to be perfect.
≠ turn off
PHRASAL VERB : V n P
see also turn-on
3.
If you say that someone turns on a particular way of behaving, you mean that they suddenly start behaving in that way, and you are often also suggesting that this is insincere. ( INFORMAL )
He could also turn on the style when the occasion demanded.
PHRASAL VERB : V P n (not pron) , also V n P
4.
If someone turns on you, they attack you or speak angrily to you.
Demonstrators turned on police, overturning vehicles and setting fire to them...
PHRASAL VERB : V P n
5.
If something turns on a particular thing, its success or truth depends on that thing.
The plot turns on whether Ilsa will choose her lover or her husband.
= hinge on
PHRASAL VERB : V P n