turn signal
noun [ C ] US uk/ˈtɜːn ˌsɪɡ.nəl/ us/ˈtɝːn ˌsɪɡ.nəl/ (also signal); (UK indicator)
（车辆）转向灯
one of the lights at the front and back of a road vehicle that flash to show which way the vehicle is turning
Synonym: blinker (LIGHT)