trip on someone or somethingand trip over someone or something
to stumble on someone or something. The place was filled with sleeping people. I tripped over perfect strangers on my way to the door. I tripped on a brick and fell into the wall.
1. To stumble or fall on account of hitting or catching the foot on something: I tripped on the curb and fell down on the sidewalk.
2. Slang To be under the influence of some hallucinogenic drug: He tried to write an essay while he was tripping on acid, and it made no sense at all.