赤線

noun

red line / (historical) Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)

彼は地図上の赤線を指でなぞった。

He traced the red line on the map with his finger.

意味（1）

red line

意味（2）

(historical) Short for 赤線地帯(あかせんちたい) (akasenchitai): Akasen (districts in Japan where prostitution and the sex industry flourished)