expression, godan verb (-su)
let light through; transmit light
Describes a material or opening that allows light to pass through it. Often used for translucent or transparent objects, or gaps that let light in.
このカーテンは光を通すので、部屋が明るい。
These curtains let light through, so the room is bright.
すりガラスは光を通すが、向こう側は
Frosted glass transmits light, but you cannot see through to the other side.