(informal) industrial action taken by members of the police, claiming sickness en masse.

A pair of trousers made from denim cotton and dyed dark blue.

(slang) a pornographic film

(obsolete, chemistry) copper sulphate

A perennial flowering plant, Evolvulus nuttallianus, with blue petals.

(astronomy) An unusually hot and blue star in globular clusters.

A solution of indigo in concentrated sulphuric acid, used as a dye

plural of blue jay

(uncountable) Noble or aristocratic ancestry. / (countable) An aristocrat.

Of a color between blue and green; darker shades are called teal, lighter ones are cyan. / (politics) Synonym of ecocapitalist; concerning ecocapitalism