Definition of poor-will in English:

poor-will

(also poorwill)

Pronunciation /po͝orˈwil/ /pʊrˈwɪl/

noun

  • A small nightjar found mainly in central and western North America.

    Three genera in the family Caprimulgidae: four species, in particular the common poor-will (Phalaenoptilus nuttallii), which hibernates in cold weather

Origin

Late 19th century imitative of its call.