A term applied to extravagant, high-falutin oratory.
1858. The sermon was a splendid failurea much ado about nothingand is yet laughed at as the Spread Eagle Sermon, as a puerile exhibition of vanity. The fewer such swelled heads, as they call them in Kentucky, preach in Saratoga, the better. They use the pulpit as certain vendors of quack remedies do the rocks along our railwaysto advertise themselves!Harpers Weekly, ii. 546/4 (Aug. 28).
1861. A friend observed to me that I could hardly expect, under the [present] circumstances, to regale my auditors with the usual amount of spread-eagleism.Henry James, 4th of July oration at Newport, R.I.