I'm sure some of you haven't read the book or haven't had a chance to brush up, and because of this, I'm posting a reference for the Lapine glossary. This way if you are participating in a RP, you not only know what everyone is saying, but you can sound more like a rabbit yourself!

Bob-stones: A traditional game among rabbits. It is played with small stones, framents of stick or the like. Fundamentally it is a very simple kind of gambling, on the lines of "Odds or Evens." A "cast" of stones on the ground is covered by the player's front paw. The opponent must then hazard some sort of surmise about its nature - e.g., one or two, light or dark, rough or smooth.
Crixa, the: The center of Efrafa, at the crossing point of two bridle paths.
Efrafa: The name of the warren founded by General Woundwort.
El-ahrairah: The rabbit folk hero. The name (Elil-hrair-rah) means "Enemies-Thousand-Prince" = The Prince with a Thousand Enemies.
Elil: Enemies (of rabbits). These include the fox, stoat, weasel, cat, owl, man, etc.
Embleer: Stinking, e.g. the smell of a fox.
Flay: Food, e.g. grass or other green fodder.
Flayrah: Unusually good food, e.g. lettuce.
Frith: The sun, personified as a god by rabbits. Frithrah! = the lord Sun - used as an exclamation.
Fu Inle: After moonrise.
Hlao: Any dimple or depression in the grass, such as that formed by a daisy plant or thistle, which can hold moisture. The name of a rabbit.
Hlao-roo: "Little Hlao." An affectionate diminutive of the name of Hlao, one of the rabbits in the story.
Hlessi: A rabbit living aboe ground, without a regular hole or warren. A wandering rabbit, living in the open. (Plural, hlessil.)
Homba: A fox. (Plural, hombil.)
Hrair: A great many; an uncountable number; any number over four since rabbits can only count up to four. U Hrair = The Thousand (enemies).
Hrairoo: "Little Thousand." The name of Fiver in Lapine.
Hraka: Droppings, excreta.
Hrududu: A tractor, car or any motor vehicle. (Plural, hrududil.)
Hyzenthlay: Literally, "Shine-dew-fur" = Fur shining like dew. The name of a doe.
Inle: Literally, the moon; also moonrise. But a second meaning carries the idea of darkness, fear and death.
Lendri: A badger.
Marli: A doe. Also carries the meaning "mother."
M'saion: "We meet them."
Narn: Nice, pleasant (to eat).
Ni-Frith: Noon.
Nildro-hain: "Blackbird's Song." The name of a doe.
Owsla: The strongest rabbits in a warren, the ruling clique. Nearly all warrens have an Owsla, or group of strong or clever rabbits - second-year or older - surrounding the Chief Rabbit and his doe and exercising authority. Owslas vary. In one warren, the Owsla may be the band of a warlord: in another, it may consist largely of clever patrollers or garden-raiders. Sometimes a good story-teller may find a place; or a seer, or intuitive rabbit.
Owslafa: The Council police (a word found only in Efrafa).
Pfeffa: A cat.
Rah: A prince, leader, or chief rabbit. Usually used as a suffix. E.g. Threarah = Lord Threar.
Roo: Used as a suffix to denote a diminutive. E.g. Hrairoo.
Sayn: Groundsel.
Silf: Outside, that is, not underground.
Silflay: To go above ground to feed. Literally, to feed outside. Also used as a noun.
Tharn: Stupefied, distraught, hypnotized with fear. But can also, in certain contexts, mean "looking foolish," or again "heartbroken" or "forlorn."
Thethuthinnang: "Movement of Leaves." The name of a doe.
Thlay: Fur.
Thlayli: "Fur-head." A nickname.
Threar: A rowan tree, or mountain ash.
Thrennion: Berries of a rowan tree.
Vair: To excrete, pass droppings.
Yona: A hedgehog. (Plural, yonil.)
Zorn: Destroyed, murdered. Denotes a catastrophe.