Etymology
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turn-on (n.)

that which arouses or excites, 1968, originally of psychedelic drugs, from verbal phrase turn on "activate (a mechanism)" (1833), specifically from figurative sense turn (someone) on "excite, stimulate, arouse," recorded from 1903; from turn (v.) + on (adv.).

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Definitions of turn-on

turn-on (n.)
something causing excitement or stimulating interest;
From wordnet.princeton.edu