1English regional the fieldfare, Turdus pilaris (now rare).
2(In full "red-flanked bluetail") an eastern Eurasian chat, Tarsiger cyanurus (or Luscinia cyanura) (family Muscicapidae), which has a blue tail in both sexes.
Origin
Mid 19th century.
Definition of bluetail in US English:
bluetail
noun
1English regional the fieldfare, Turdus pilaris (now rare).
2(In full "red-flanked bluetail") an eastern Eurasian chat, Tarsiger cyanurus (or Luscinia cyanura) (family Muscicapidae), which has a blue tail in both sexes.