To power up (a device), to start, to cause to start operating.(verb)
To cause to take up drugs, especially hallucinogens.(verb)
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Use "turn on" in a sentence
"Their counterproposal that Jeane Kirkpatrick should move from the United Nations to the White House foundered in turn on opposition from Baker and Deaver, as well as Shultz."
"In less time than it takes to turn on a vacuum cleaner, Ruby had power-washed the entire house."
"We stayed at Coney Island until just past noon, strolling the midways, playing Skee-Ball, and even taking a turn on the strange Matterhorn-themed ride that spins riders past spray-painted images of the Swiss Alps and giant rest-in-peace portraits of Tupac Shakur and Biggie Smalls, while blasting hip-hop from Hot 97 at eardrum-exploding volume."