turn signal
US /ˈtɝːn ˌsɪɡ.nəl/
UK /ˈtɝːn ˌsɪɡ.nəl/

1.
lampu sein, lampu isyarat belok
a flashing light on a vehicle that indicates the driver's intention to turn left or right, or to change lanes
:
•
Don't forget to use your turn signal when changing lanes.
Jangan lupa gunakan lampu sein saat berpindah jalur.
•
The driver failed to activate his turn signal before making the turn.
Pengemudi gagal menyalakan lampu sein sebelum berbelok.