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" ;