blue light

American  

[bloo lahyt] / ˈblu ˈlaɪt /

noun

1. a band of the visible light spectrum that has a shorter wavelength and produces higher energy than other colors of light: occurring in sunlight and emitted by electronic devices that use LED technology.

2. American History, Usually Disparaging. Also Blue Light a member of a faction of the American Federalist party considered disloyal for opposing the War of 1812: so called from the claim that they flashed blue light signals to alert the British to the presence of blockade runners.

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Etymology

Origin of blue light

First recorded in 1810–15

Example Sentences

The words pulse in blue light.

From Literature

Police Scotland has rescinded authorisation for some officers to provide a blue light response to emergencies when they are driving police vans, while others will not be allowed to take part in the initial phase of a pursuit.

From BBC

Assistant Chief Constable Lynn Ratcliff said all officers driving police cars will still be able to provide a blue light response to emergency calls.

From BBC

Ratcliff said blue light police pursuits were rare and there were plenty of trained officers able to carry out emergency responses while the training is rolled out.

From BBC

Remarkably, the original tapestry contains just seven colours - light and dark blue, light and dark green, a dark turquoise, a red and a yellow.

From BBC