0 the flashing lights and siren (= loud warning noise) used by a police car or other emergency vehicle when it is travelling somewhere urgently:
We're in a police car, blues and twos going, in pursuit.
Walking home on Tuesday evening I was alarmed by the blues and twos coming from a string of fire engines and police cars.
The police officer admitted he had not used his "blues and twos" so the suspect driver would not flee.
NIEUWE WOORDEN
European
May 10, 2021
WOORD VAN DE DAG
Shimmer
blues and twos