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Difference between Brass hat and Tin hat

brass hat—(coll.)

1. a senior officer in the armed forces:

  • For two hours in late January, the brass hats of the Pentagon cloistered themselves with President Clinton.

2. any important or influential person:

  • The trouble was that he was a curate, and the brass hats of the Church look askance at curates who swat parishioners.

tin hata steel trench helmet:

  • The trench hat, “the old tin hat,” is coming into quite extensive use as a means of head protection against small falls of rock in mines.