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A trencher (from Old French tranchier; "to cut") is a type of tableware, commonly used in medieval cuisine. A trencher was originally a flat round of bread used as a plate, upon which the food could be placed before being eaten. At the end of the meal, the trencher could be eaten with sauce, but was more frequently given as alms to the poor. Later the trencher evolved into a small plate of metal or wood.
An individual salt dish or squat open salt cellar placed near a trencher was called a trencher salt.
A "trencherman" is one devoted to eating and drinking, often to excess; one with a hearty appetite, a gourmand. A secondary use, generally archaic, is one who frequents another's table, in essence a pilferer of another's food.
A "trencher-fed pack" is a pack of foxhounds or harriers in which the hounds are kept individually by hunt members and only assembled as a pack to hunt. Usually, a pack of hounds are maintained together as a pack in kennels.
"Turn the Trencher" was a traditional children's party game in which an adult spun a platter on its edge in the middle of a seated ring of children. The child whose name was called had to stand and run to catch the platter before it fell. Failure entailed a forfeit or minor ordeal. The game was current as late as the mid twentieth century.
In Virgil's Aeneid, trenchers are the object of a prophecy. In bk.3, Aeneas recounts to Dido how after a battle between the Trojans and the Harpies, Calaeno, chief of the Furies, prophesied to him (claiming to have the knowledge from Apollo) that he would finally arrive in Italy, but
Never shall you build your promised city
Until the injury you did us by this slaughter
Has brought you to a hunger so cruel
That you gnaw your very tables.
The prophecy is fulfilled in bk.7, when the Trojans eat the trenchers after a frugal feast. Aeneas' son Ascanius jokes that they are so hungry they would have eaten the tables, at which point Aeneas realises that the prophecy has been fulfilled. However, he reattributes the prophecy to his deceased father, Anchises:
I now can tell you, my father Anchises
Revealed these secrets to me for he said:
"When you have sailed, son, to an unknown shore
And, short of food, are driven to eat your tables,
Then, weary though you are, hope you are home
The Middle Ages, Everyday Life in Medieval Europe, by Jeffrey L. Singman, (Sterling publishers) offers the following observation: "The place setting also included a trencher, a round slice of bread from the bottom or the top of an old loaf, having a hard crust and serving as a plate. After the meal, the sauce-soaked trenchers were probably distributed to servants or the poor. Food was served on platters, commonly one platter to two diners, from which they transferred it to their trenchers."
Live loathed and long,Cap and knee slaves, vapours, and minute-jacks! 
Most smiling, smooth, detested parasites,
Courteous destroyers, affable wolves, meek bears,
You fools of fortune, trencher-friends, time's flies,
- Meads, Chris (2001). Banquets set forth: banqueting in English Renaissance drama. Manchester University Press. p. 47. ISBN 0-7190-5567-9.
- Pease, Alfred E. (1902). Adventures Of A Trencher Fed Pack Fox Hounds.
- Virgil, "The Aeneid", trans. by C.H. Sisson (London: Everyman 1998) p.66
- Virgil, "The Aeneid", trans. by C.H. Sisson (London: Everyman 1998) p.183