Definition of pleep in English:

pleep

(also plip)

Pronunciation /pliːp/

noun

Scottish
  • (chiefly Orkney and Shetland). A shrill piping cry, especially that of a wading bird; the weak peeping cry of a young bird.

Origin

Late 19th century; earliest use found in Charles Swainson (fl. 1885), folklorist. Imitative.