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brass

brass /ˈbræs/ Brit /ˈbrɑːs/ noun
plural brasses
brass
/ˈbræs/ Brit /ˈbrɑːs/
noun
plural brasses
Britannica Dictionary definition of BRASS
[noncount] : a yellow metal that is made by combining copper and zinc often used before another noun
: musical instruments (such as trumpets, trombones, and tubas) that are made of brass
[noncount]
[plural]
often used before another noun
see also brass band
[noncount] : bright metal objects made of brass
[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.

(as) bold as brass

see 1bold

get down to brass tacks

informal
: to start to discuss or consider the most important details or facts about something