| black-and-blue |
discolored or covered with discolorations from blood coagulated under the skin; bruised. |
| blue baby |
an infant born with blue-tinged skin from insufficient oxygen in the blood, caused by a congenital heart or lung defect. |
| blue blood |
noble, aristocratic, or socially prominent lineage. [2 definitions] |
| blue book |
an official U.S. government publication, such as a report or register, often with a blue cover. [3 definitions] |
| blue cheese |
a rich strong-flavored semisoft cheese made of cow's milk and veined with blue mold. |
| blue chip |
in poker, a blue playing chip having the highest value. [3 definitions] |
| blue flag |
any of several North American wild irises that bear blue flowers. |
| blue fox |
the arctic fox during its summer bluish gray phase, or a mutant of the arctic fox that is this color throughout the year. [2 definitions] |
| blue gum |
a tall eucalyptus tree native to Australia and widely cultivated in California, with aromatic leaves and a smooth bark that peels off in shreds. |
| 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 law |
any law prohibiting drinking, dancing, working, or doing business on Sunday. |
| blue point |
a variety of Siamese cat with a pale body and dark bluish gray points. |
| blue ribbon |
the emblem awarded as first prize in a contest or competition. [2 definitions] |
| blue streak |
(informal) something moving with or as with the speed of lightning. [2 definitions] |
| 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. |
| blue-chip |
denoting common stock that commands a high price because of its record of steady earnings. [2 definitions] |
| blue-collar |
of or pertaining to industrial workers or the class of workers who earn wages rather than salaries. (Cf. white-collar.) |
| blue-pencil |
to edit or strike out with or as with a blue pencil. |
| blue-ribbon |
representing or being the best of a kind or type. |