Definition of high brass
1
: brass containing at least 33 percent zinc — compare low brass
2
: high-ranking officers or officials
the living honorees weren't always political or military or railroad high brass— B. A. Botkin & A. F. Harlow doesn't know enlisted men and their opinion of high brass— G. W. Johnson
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Merriam-Webster unabridged
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Time Traveler for high brass
The first known use of high brass was in 1951
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