Etymology
Advertisement
brass (n.)

"yellow malleable alloy metal, harder than copper," Old English bræs "brass, bronze," originally any alloy of copper, in England usually with tin (this is now called bronze), later and in modern use an alloy of roughly two parts copper to one part zinc. A mystery word, with no known cognates beyond English. Perhaps akin to French brasser "to brew," because it is an alloy. It also has been compared to Old Swedish brasa "fire," but no sure connection can be made. Yet another theory connects it with Latin ferrum "iron," itself of obscure origin.

Words for "brass" in other languages (such as German Messing, Old English mæsling, French laiton, Italian ottone) also tend to be difficult to explain. As brass was unknown in early antiquity (it was well-known to Strabo, 1c., but not mentioned by Homer), the use of the English word in Bible translations, etc., likely means "bronze." The Romans were the first to deliberately make it.

When works of Greek and Roman antiquity in 'brass' began to be critically examined, and their material discriminated, the Italian word for 'brass' (bronzo, bronze) came into use to distinguish this 'ancient brass' from the current alloy. [OED]

Rhetorically or figuratively it was the common type of hardness, durability, or obduracy since late 14c. The meaning "effrontery, impudence, excessive assurance" is from 1620s. Slang sense of "high officials" is first recorded 1899, from their insignia. Meaning "brass musical instruments of a band" is from 1832.

Related entries & more 
Advertisement
brass (adj.)

"made of brass," c. 1400, from brass (n.). Compare brazen (adj.). Slang brass balls "toughness, courage" (emphatically combining two words that serve as metaphors for the same thing) is attested by 1960s. Brass-band is from 1827.

The figurative brass tacks "essentials of a matter" that you get down to (1897, popular from c. 1910) perhaps are the ones said to have been nailed to the counters of a dry goods stores and used to measure cloth, suggesting precision, but the metaphor was unclear from the start, and brass tacks or nails in late 19c. were commonly noted as being used in upholstering. A 1911 advertisement begins " 'Getting down to brass tacks' is a characteristic American slang phrase, full of suggestion but of obscure origin."

The figurative brass monkey that suffers anatomical loss in freezing weather is attested by 1843:

Old Knites was as cool as a cucumber, and would have been so, independent of the weather, which, as he expressed it, was cold enough to freeze the nose off a brass monkey. ["An Incident of the Canadian Rebellion," in The Worcester Magazine, June, 1843]

Melville  ("Omoo," 1847) has a twist on the image in "hot enough to melt the nose h'off a brass monkey."

Related entries & more 
brass (v.)
"to coat or cover with brass," 1865, from brass (n.). Compare braze (v.2). Related: Brassed; brassing.
Related entries & more 
braze (v.2)
"to make of or cover in brass," Old English brasian "to do work in brass, make of brass," from bræs (see brass (n.)). Compare glaze from glass.
Related entries & more 
brassy (adj.)
"impudent," 1570s, from brass (n.) + -y (2). Compare brazen. Literal sense of "coated with brass" is from 1580s. Sense of "debased and pretentious" is from 1580s, from brass as contrasted with gold; sense of "strident and artificial" is from 1865. Related: Brassily; brassiness.
Related entries & more 
Advertisement
brazen (adj.)
Old English bræsen "of brass," from bræs "brass" (see brass (n.)) + -en (2). The figurative sense of "hardened in effrontery" is from 1570s (in brazen-faced), perhaps suggesting a face unable to show shame. To brazen it "face impudently" is from 1550s. Related: Brazenly.
Related entries & more 
bronze (n.)

1721, "alloy of copper and (usually) a smaller amount of tin," from French bronze, from Italian bronzo, from Medieval Latin bronzium, which is of uncertain origin. Perhaps cognate (via notion of color) with Venetian bronza "glowing coals," or German brunst "fire." Perhaps influenced by Latin Brundisium the Italian town of Brindisi (Pliny writes of aes Brundusinum). Perhaps ultimately from Persian birinj "copper."

In Middle English, the distinction between bronze (copper-tin alloy) and brass (copper-zinc alloy) was not clear, and both were called bras (see brass (n.)). Used historically for bells, cannons, statuary, and fine mechanical works. Also from French are Dutch brons, German Bronze, etc., and ultimately from the Medieval Latin word are Spanish bronce, Russian bronza, Polish bronc, Albanian brunze, etc.

A bronze medal has been given to a third-place finisher at least since 1852. The archaeological Bronze Age (1850) falls between the Stone and Iron ages, and is a reference to the principal material for making weapons and ornaments.

Related entries & more 
oom-pah 

also oompah, 1877, imitative of the sound of a bass brass instruments.

Related entries & more 
aureate (adj.)
early 15c., "resembling gold, gold-colored," also figuratively, "splendid, brilliant," from Latin aureatus "decorated with gold," from aureus "golden," from aurum "gold," from PIE root *aus- (2) "gold" (source also of Sanskrit ayah "metal," Avestan ayo, Latin aes "brass," Old English ar "brass, copper, bronze," Gothic aiz "bronze," Old Lithuanian ausas "gold"), which is probably related to root *aus- (1) "to shine."

Especially of highly ornamented literary or rhetorical styles. Related: Aureation.
Related entries & more 
zill (n.)

"brass finger cymbal used (four at a time) by belly-dancers in certain performances," by 1976, from Turkish zil "cymbal." Related: Zills.

Related entries & more