turn on in WordNet English dictionary

1. cause to be agitated, excited, or roused
   "The speaker charged up the crowd with his inflammatory remarks"
   agitate  rouse  turn on  charge  commove  excite  charge up 
   
2. stimulate sexually
   "This movie usually arouses the male audience"
   arouse  sex  excite  turn on  wind up 
   
3. be contingent on
   "The outcomes rides on the results of the election"; "Your grade will depends on your homework"
   depend on  devolve on  depend upon  ride  turn on  hinge on  hinge upon 
   
4. get high, stoned, or drugged
   "He trips every weekend"
   trip  trip out  turn on  get off 
   
5. cause to operate by flipping a switch
   "switch on the light"; "turn on the stereo"
   switch on  turn on 
   
6. become hostile towards
   "The dog suddenly turned on the mailman"
   turn on 
   
7. produce suddenly or automatically
   "Turn on the charm"; "turn on the waterworks"
   turn on 
   

turn on in English Wiktionary