A journey or excursion, especially for pleasure. We went on a trip to the mountains last weekend.
A stumble or fall caused by catching one's foot on something. He had a trip on the uneven pavement and nearly fell.
A hallucinatory experience induced by drugs. He described his first LSD trip as both terrifying and enlightening.
The act of releasing or triggering a switch or safety device, especially in an electrical circuit. A sudden surge caused a trip of the circuit breaker, cutting the power.