(slang, dated) To do something well or thoroughly.

plural of brown bag test

(US, historical) The alleged practice of comparing an African-American's skin color to that of a brown paper bag, allowing them certain privileges only if the skin was lighter.

Aricia artaxerxes, a species of brown butterfly.

plural of small brown crow

A smallish nymphalid butterfly, Euploea darchia, brown with white spots, endemic to northern Australia.

Lopholithodes foraminatus, a king crab that lives from Prince William Sound, Alaska to San Diego, California.

plural of brown box crab

Bicyclus xeneas, a species of tropical African butterfly.

Campylorhamphus pusillus, a species of scythebill bird in the genus Campylorhamphus.