Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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blue in the face exhausted from too much effort or activity.
blue jay a common jay bird of eastern North America. A blue jay has a crest on its head and a bright blue upper body with white and black markings on its wings and tail.
blue whale a mammal that lives in the ocean. Blue whales are the largest kind of animal that has ever lived. They can grow up to 100 feet long and weigh up to 150 tons. Their large mouths have baleen instead of teeth. Blue whales use baleen to filter lots of very small food such as shrimp from ocean water.
out of the blue without warning; suddenly.
the blue the sky. [2 definitions]