blue canary
n.— «I’ve got to admit I was only a little surprised by the fact that the cops ran in the building without gear, common sense, etc. Have you ever seen cops approach the scene of a possible Haz-Mat incident? They’re not called “Blue Canaries” for nothing!» —“Re: COPS last saturday” by Harry Fell Usenet: misc.emerg-services Sept. 14, 1995. (source: Double-Tongued Dictionary)
Further reading
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