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- Kyraun, keeraun; a small bit broken off from a sod of turf. Irish caor, or with the diminutive, caorán, same sound and meaning.
- Laaban; a rotten sterile egg (Morris: for South Monaghan): same as Glugger, which see. Irish láb or láib, mire, dirt, with diminutive.
- Lad; a mischievous tricky fellow:—'There's no standing them lads.' (Gerald Griffin.)
- Lagheryman or Logheryman. (Ulster.) Same as Leprachaun, which see.
- Lambaisting; a sound beating. Quite common in Munster.
- Langel; to tie the fore and the hind leg of a cow or goat with a spancel or fetter to prevent it going over fences. (Ulster.) Irish langal, same sound and meaning.
- Lapcock; an armful or roll of grass laid down on the sward to dry for hay. (Ulster.)
- Lark-heeled; applied to a person having long sharp heels. See Saulavotcheer.
- Larrup; to wallop, to beat soundly. (Donegal and South.)
- Lashings, plenty: lashings and leavings, plenty and to spare: specially applied to food at meals. (General.)
- Lassog, a blaze of light. (Morris: South Monaghan.) From Irish las, light, with the diminutive.
- Lauchy; applied to a person in the sense of pleasant, good-natured, lovable. Irish láchaiidhe, same sound and sense. (Banim: general in the South.) 'He's a lauchy boy.'
- Laudy-daw; a pretentious fellow that sets up to be a great swell. (Moran: Carlow; and South.)