Source : WordNet®

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