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1. A high-ranking military officer.
2. A high-ranking civilian official.
[From the gold braid on the hat.]
informal Brit a top-ranking official, esp a military officer
[C20: from the gold leaf decoration on the peaks of caps worn by officers of high rank]
a person in a high position.
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|Noun||1.||brass hat - a high-ranking military officer|
armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"