1.  A round cap with a low, flat crown, worn in the 16–17th c. by London citizens. Obs.

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1598.  B. Jonson, Ev. Man in Hum., II. i.

                    Mock me all over
From my flat-cap, unto my shining shoes.

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1615.  J. Stephens, Satyr. Ess., 292. He makes Poems that consist onely of verse and rime in stead of excellent composures, with the same confidence that ignorant Painters make a broad face and a flat-cap to signifie King Harry the eight.

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1630.  Dekker, 2nd Pt. Honest Wh., I. Wks. 1873, II. 110.

        Flat Caps as proper are to Citty Gownes,
As to Armors Helmets, or to Kings their Crownes.

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1688.  R. Holme, Armoury, III. i. 11/2. A Flat Cap, Sable.

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1891.  C. Creighton, Hist. Epidemics Brit., 483. The sight of a Londoner’s flat-cap was dreadful to a lob: a treble ruff threw a whole village into a sweat.

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  † 2.  One who wears a flat-cap; esp. a London citizen or ’prentice. Obs.

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1600.  Heywood, 2st Pt. Edw. IV., I. Wks. 1874, I. 18.

        Flat-caps thou call’st vs. We scorne not the name,
And shortly, by the vertue of our swords,
We’ll make your cappe so fit unto your crowne,
As sconce and cappe and all shall kisse the ground.

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1631.  Dekker, Match Mee, I. Wks. 1873, IV. 149. King. What’s her Husband? Lad. A flatcap.

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1719.  D’Urfey, Pills, IV. 109.

        If you walk the Town of London,
  Where the Flat-caps call Men Cousins.

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1823.  Scott, Nigel, xv. My Lord Dalgarno took your part, and it was e’en borne down by the popular voice of the courtiers, who spoke of you as one who had betaken yourself to living a town-life, and risking your baron’s coronet amongst the flatcaps of the city.

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  3.  A size of writing-paper, usually 14 × 17 inches.

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1875.  in Knight, Dict. Mech.

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