noun
a colloquial term used in the UK to refer to the flashing blue lights and sirens on emergency vehicles
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The ambulance rushed through the traffic with blues and twos on.
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We knew it was serious when we heard the blues and twos approaching.
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When you hear the blues and twos, you know someone's in trouble.
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The sirens blaring like blues and twos in my head, warning me of impending danger.