I just realized that I forgot to post the first Forgotten English of 2010. Allow me to correct that.
Gilravage - To hold a merry meeting, with noise and riot, but without doing injury to anyone. (Etymological Dictionary of the Scottish Language, 1808)
Cat in pan - To turn cat in pan is a proverbial expression signifying a changing of sides in religion or politics. (Etymological Dictionary of Obsolete Words, 1832)
Ackenpucky - Any food mixture of unknown ingredients. (American Dialect Dictionary, 1944)
Jammock - A soft, pulpy substance (Dictionary of Archaic and Provincial Words, 1855) OR to squeeze, press into a soft mass, hence jammocked, worn out, exhausted. (English Dialect Dictionary, 1896)
Affray - A skirmish or fighting between two or more. It is oft-times confounded with assault. But they differ in that an assault is only a wrong to the party, but an affray may also be without word or blow given, as if a man shew himself furnished with armor or weapons not usually worn, it may strike fear into others unarmed. (Law Dictionary and Glossary, 1717)
Dight - To prepare; to put in order (American Dictionary of the English Language, 1828)
Genethliacks - The science of calculating nativities, or predicting the future events of life from the stars predominant at birth. (Dictionary of the English Language, 1755)
Aftertale - Postscript (Dictionary of the Oldest Words in the English Language, 1863)
Pinchery - A state of extreme carefulness approaching to miserliness. (Yorkshire Folk-talk, 1892)
Ear-biting - This old mode of expressing pleasure, which seems to be taken from the practice of animals who, in a playful mood, bite each other's ears (Glossary of the Works of Shakespeare, 1902)
Chouse - To cheat; to defraud (Americanisms Old and New, 1889)
Connecticutensian - An inhabitant of Connecticut (Dictionary of American English, 1940)
Clagham - A treacle made hard by boiling (Glossary of North Country Words, 1825)
Spurticles - Spectacles (The Dialect of Hartland, Devonshire, 1891)
Bowssening - Casting mad people into the sea, or immersing them in water until they are well-nigh drowned (Superstitions Connected with Medicine and Surgery, 1844)
Coach-fellow - A horse employed to draw in the same carriage with another (Dictionary of Archaic and Provincial Words, 1855)
Awblaster - A cross-bowman (Etymological Dictionary of the Scottish Language, 1808)
Mothery - Thick, mouldy, as beer or vinegar when stale (Glossary of Provincial Words and Phrases in Wiltshire, 1842)
Friday-face - A grave or gloomy expression of the countenance (New English Dictionary, 1901) [this is thanks to Lord Byron, who apparently hated Fridays with the passion of a thousand suns]
Thorough cough - Coughing and breaking wind backwards at the same time (Classical Dictionary of the Vulgar Tongue, 1796) [HA!]
Searisque - Hazard at sea (Dictionary of the English Language, 1755)
Holy-falls - Trousers buttoned breeches-fashion, having the flap, not the fly, front (Folk-Phrases of Four Countries: Gloucestershire, Staffordshire, Warwickshire and Worcestershire, 1894)
Dern - Of actions done or proceeding in secret, or in the dark (New English Dictionary, 1897)
Kintra-cooser - A human stallion; a fellow who debauches many country girls (Scottish Gallovidian Encyclopedia, 1824)
Diddlecum - Half-mad; sorely teased (Glossary of Devonshire Words, 1896)
Headsman - An executioner (Glossary of the Works of Shakespeare, 1902) [really? This one's forgotten?]