1) Becomes faint 2) Becomes less luminous 3) Becomes shadowy 4) Befogs 5) Darkens 6) Darkens a bit 7) Dials down 8) Fades out 9) Gets darker 10) Goes to low beam 11) Goes to low on the road 12) Grows dark 13) Grows faint 14) Hits the low beam 15) Hits the low beams 16) Lessens in intensity 17) Loses brightness 1) Blears 2) Darkens 3) Lowers