"tripper" in the noun sense
1. tripper
slang) someone who has taken a psychedelic drug and is undergoing hallucinations
2. stumbler, tripper
a walker or runner who trips and almost falls
3. sightseer, excursionist, tripper, rubberneck
a tourist who is visiting sights of interest
4. tripper, trip
a catch mechanism that acts as a switch
"the pressure activates the tripper and releases the water"
Source: WordNet® (An amazing lexical database of English)
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