Definition of jack bird in English:

jack bird

Pronunciation /ˈdʒak bəːd/

noun

  • 1British dialect, rare The fieldfare, Turdus pilaris.

  • 2New Zealand The juvenile of the South Island saddleback, Philesturnus carunculatus, a wattlebird.

    Formerly regarded as a species distinct from the adult.

Origin

Mid 19th century; earliest use found in John C. Atkinson (1814–1900), author and antiquary. From Jack + bird.