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 crescent moon shone overhead, and the blue light of the day made it seem as though nothing had changed.

From Literature

Most of these children were born during the pandemic and spent much of their infancy quarantined indoors, their earliest socialization filtered through the blue light of tablets and television, Aguet said.

From Los Angeles Times

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Police Scotland has rescinded authorisation for some officers to provide a blue light response to emergencies when they are driving police vans, while others will not be allowed to take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