<p><strong>Noun</strong></p><ul><li>A person or thing that trips.</li><li>Machinery: a tripping mechanism; a trip.</li><li>An apparatus causing a signal or other operating device to be tripped or actuated.</li><li>(British Informal) A person who goes on a pleasure trip or excursion; excursionist.</li><li>(Slang) A person who is under the influence of a hallucinogenic drug, especially LSD.</li></ul>