| 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 excessive effort or activity. |
| blue jay |
a common jay of eastern North America, with a crest, a bright blue upper body and head, and distinctive white and black markings. |
| 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 |
the largest whale, as much as one hundred feet long, with a bluish gray back, yellow undersides, and grooves running lengthwise on the throat and abdomen. |
| 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. |