Noun:

1. (slang) someone who has taken a psychedelic drug and is undergoing hallucinations

2. a walker or runner who trips and almost falls

3. a tourist who is visiting sights of interest

4. a catch mechanism that acts as a switch;

   "the pressure activates the tripper and releases the water"
   

excursionistn.旅行者；短途旅行者

touristn.旅游者；二等舱adj.观光的；乘坐二等舱的

holidaymakern.<英>度假者

visitorn.参观者；访问者；访客

rubberneckn.伸长脖子看(或听)的人；观光客；好奇者v.伸长脖子看

stumblern.跌跤者；有过失者；结结巴巴说话者；蹒跚行走者

tripn.旅行；摔倒；差错；轻快的步伐vt.使跌倒；使失败；使犯错；起锚；竖帆vi.绊倒；旅行；轻快地走；失误；结巴

sightseern.观光者；游客；看热闹的人

1. The beach was packed with day trippers.
   海滩上到处都是当日远足的人。