Learner's definition of BRASS
1 [noncount] : a yellow metal that is made by combining copper and zinc — often used before another noun 2 : musical instruments (such as trumpets, trombones, and tubas) that are made of brass
[plural] — often used before another noun
3 [noncount] : bright metal objects made of brass 4 [noncount], chiefly US, informal : the people in the highest positions in an organization (such as the military or a business) — often used with the
◊ Brass is used with both plural and singular verbs in this sense.
get down to brass tacksinformal
: to start to discuss or consider the most important details or facts about something