[f. FOUR a. + PENCE.] A sum of money or coin equal to four pennies. Fourpence-halfpenny: see quots. 1722, 1860.

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  The Irish shilling of Elizabeth circulated in England under the name and at the value of ‘ninepence’; it is inferred that the ‘fourpence-halfpenny’ was the Irish sixpence of the same period.

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1722.  De Foe, Col. Jack (1840), 46. But there he was balked, for it was a paper of old thirteenpence-halfpenny pieces, half and quarter pieces, with ninepences, and fourpence-halfpennies, all old crooked money, Scotch and Irish coin.

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1852.  R. S. Surtees, Sponge’s Sp. Tour (1893) 319. ‘Well, there’s sixpence for you, my good woman,’ said he…. ‘Its nabbut fourpence,’ observed the woman.

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1860.  Bartlett, Dictionary of Americanisms, s.v. Federal Currency, The [Spanish] half real … is called … in New England, fourpence ha’penny, or simply fourpence.

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1872.  O. W. Holmes, Poet Breakf-t., iii. (1885), 75. Give me two fo’pencehappenies for a ninepence.

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