trip on (someone or something)
1. Literally, to bump into someone or something with one's foot and stumble or fall as a result. He tripped on the step running up the stairs and fell face first on the hallway. She tiptoed out of the room, trying not to trip on anyone as she left.
2. slang To experience the psychotropic effects, especially audio or visual hallucination, of some drug. Don't listen to him—he's been tripping on acid for the last three hours. We spent the weekend tripping on mushrooms while we went on hikes so we could better appreciate nature's beauty.
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