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From Middle English bras, bres, from Old English bræs (“brass, bronze”), of uncertain origin. Perhaps representing a backformation from Proto-Germanic *brasnaz (“brazen”), from or related to *brasō (“fire, pyre”). Compare Old Norse and Icelandic bras (“solder”), Icelandic brasa (“to harden in the fire”), Swedish brasa (“a small controlled fire”), Danish brase (“to fry”); French braser ("to solder"; > English braise) from the same Germanic root. Compare also Middle Dutch braspenninc ("a silver coin", literally, "silver-penny"; > Dutch braspenning), Old Frisian bress (“copper”), Middle Low German bras (“metal, ore”). In the military sense an ellipsis of the brass hats.

From Middle English bras, bres, from Old English bræs (“brass, bronze”), of uncertain origin. Perhaps representing a backformation from Proto-Germanic *brasnaz (“brazen”), from or related to *brasō (“fire, pyre”). Compare Old Norse and Icelandic bras (“solder”), Icelandic brasa (“to harden in the fire”), Swedish brasa (“a small controlled fire”), Danish brase (“to fry”); French braser ("to solder"; > English braise) from the same Germanic root. Compare also Middle Dutch braspenninc ("a silver coin", literally, "silver-penny"; > Dutch braspenning), Old Frisian bress (“copper”), Middle Low German bras (“metal, ore”). In the military sense an ellipsis of the brass hats.

By ellipsis from brass nail, in turn from "nail[ing]" (fig.) and "brass blonde" (see "brazen"); and also shortened from Cockney Rhyming slang brass flute for "prostitute".

From Portuguese braça and Spanish braza, from Old Galician-Portuguese and Old Spanish braça, from Latin brachia, variant of bracchium (“arm, cubit”), from Ancient Greek βραχίων (brakhíōn, “upper arm”).