or Lubrican. (Irish, Lobaircin or Leprechaun.) A fairy resembling an old man, by profession a maker of brogues, who resorts to out-of-the-way places, where he is discovered by the noise of his hammer. He is rich, and while anyone keeps his eye fixed upon him cannot escape, but the moment the eye is withdrawn he vanishes.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894