Definition of willow wren in English:

willow wren

noun

British
  • another term for willow warbler
    • ‘A flock of unusual birds, which I suppose to be the willow wrens was discovered in September, 1839, on the shore of the Lake, near this city.’
    • ‘White was also the first to identify three leaf warblers: the chiffchaff, willow warbler and wood warbler, then all known as willow wrens.’
    • ‘But in a little-known work by the Brothers Grimm, a far more unassuming creature has that status: the willow wren.’