blues and twos

Noun

UK informal plural plural-only

(chiefly UK, informal, law enforcement) The flashing blue lights and (originally) two-tone siren of a police vehicle.

Japanese Meaning

（英国、非公式、警察）パトカーに装備された、青色の点滅灯と（元々は）2音のサイレンを指す表現

The police car thundered through the intersection with its blues and twos wailing.

パトカーは交差点を轟音を立てて通り抜け、青色の点滅灯と二音のサイレンを鳴らしていた。

Sense（1）

(chiefly UK, informal, law enforcement) The flashing blue lights and (originally) two-tone siren of a police vehicle.

They grinned at each other and hit their blues and twos.