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