To accumulate stroke on stroke, effort on effort.

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1839.  Well, I don’t go much to theatricals, that’s a fact; but I do think he piled the agony up a little too high in that last scene.—Marryat, ‘Diary in America,’ ii. 235. (N.E.D.) (Italics in the original.)

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1844.  It was thought by some that he “piled the agony” on a little too hard, and rolling and writhing about upon the ground, was decidedly “not the thing.”—Watmough, ‘Scribblings and Sketches,’ p. 178 (Phila.).

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1846.  When he gin me the fust lick it made me sorter mad, but I woodn’t a minded ef he hadn’t kept pilin on the agony ’bout my eyes and smeller.—W. T. Porter, ed., ‘A Quarter Race in Kentucky,’ etc., p. 45.

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1852.  If you have any more agony to pile on him, put it on.—Knick. Mag., xl. 339 (Oct.).

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1854.  “I think he loves you.” “Yes, but he didn’t pile up the agony high enough.”—Weekly Oregonian, Sept. 23.

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1856.  Not being one of your ’cute sort, I have n’t piled the agony on as I might have done.—Knick Mag., xlviii. 621 (Dec.).

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1857.  Three raving, lying, free-negro journals, is piling up the agony a little too steep.—Oregon Weekly Times, Nov. 14.

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1860.  It seems to me that gentlemen are rather disposed to pile up the agony on us.—Mr. Brown of Mississippi, U.S. Senate, June 18: Cong. Globe, p. 3109.

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