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canary fits
plural of canary fit
warrant canary
(US) A public notice that a service provider has not received a secret government subpoena for their customers' data that they would be prohibited from saying they had received.
canary creeper
Tropaeolum peregrinum, a climbing plant native to western South America.
canary creepers
plural of canary creeper
climate canary
A species that is affected by an environmental danger prior to other species, thus serving as an early warning system for the other species with regard to a danger.
cat that ate the canary
(idiomatic) A person who appears self-satisfied or smug, especially while concealing something mischievous, prohibited, or private.
canary in a coal mine
(idiomatic) Something whose sensitivity to adverse conditions makes it a useful early indicator of such conditions; something which warns of the coming of greater danger or trouble by a deterioration in its health or welfare.