redback

noun3

1. •
   (Australia) A venomous spider, Latrodectus hasselti, endemic to Australia.

   • “If you find a redback, squash it firmly,” advised one guide. — 1988
2. •
   (slang) the yuan (CNY), the currency of the People's Republic of China (Red Chinese money)
3. •
   (US) A brown and white sandpiper (Calidris alpina), native to the Northern Hemisphere; the dunlin.