WordWeb Online

1. [slang] Someone who has taken a psychedelic drug and is undergoing hallucinations
    
2. A walker or runner who trips and almost falls
   - stumbler
    
3. [Brit, informal] A tourist who is visiting sights of interest
   - sightseer, excursionist, rubberneck [informal]
    
4. A catch mechanism that acts as a switch
   "the pressure activates the tripper and releases the water";
   - trip

Derived forms: trippers

Type of: catch, drug user, footer, holidaymaker [Brit, Cdn], pedestrian, stop, substance abuser, tourer, tourist, user, vacationist [N. Amer], walker

Encyclopedia: Tripper