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(functioning as plural) informal the most important or high-ranking officials or leaders, as in politics, industry, etc. See also brass5
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|Noun||1.||top brass - the most important persons in a governing body|
governance, governing body, organisation, administration, brass, establishment, organization - the persons (or committees or departments etc.) who make up a body for the purpose of administering something; "he claims that the present administration is corrupt"; "the governance of an association is responsible to its members"; "he quickly became recognized as a member of the establishment"